Let's get as scientific as we can here.
Under extreme stress, fatigue or illness, the INTP's shadow may appear - a negative form of ESFJ. Example characteristics are:
* expressing intense negative emotions towards others
* being very sensitive to criticism
* becoming preoccupied with details, without any logical basis
* interpreting facts or events in a very subjective way
Under extreme stress, fatigue or illness, the ENTP's shadow may appear - a negative form of ISFJ. Example characteristics are:
* being pedantic about unimportant details
* doing things to excess - e.g.: eating, drinking or exercising
* expressing emotions in an intensive and uncontrolled way
* being very sensitive to criticism
Under extreme stress, fatigue or illness, the INTJ's shadow may appear - a negative form of ESFP. Example characteristics are:
* doing things to excess - e.g.: eating, drinking or exercising
* acting very impulsively, perhaps starting off more projects than the INTJ could hope to accomplish
* expressing emotions in an intensive and uncontrolled way
* being very sensitive to criticism
* asking for lots of information that is irrelevant
Under extreme stress, fatigue or illness, the ENTJ's shadow may appear - a negative form of ISFP. Example characteristics are:
* withdrawing and wanting to be alone
* having intense emotions, that may or may not be expressed
* being very sensitive to criticism
* acting very impulsively, doing things to excess
Under extreme stress, fatigue or illness, the INFP's shadow may appear - a negative form of ESTJ. Example characteristics are:
* being very critical and find fault with almost everything
* doing things to excess - e.g.: eating, drinking or exercising
* becoming bossy or domineering and ignoring others' feelings
* being pedantic about unimportant details
Under extreme stress, fatigue or illness, the ENFP's shadow may appear - a negative form of ISTJ. Example characteristics are:
* being pedantic about unimportant details
* doing things to excess - e.g.: eating, drinking or exercising
* being critical of others, and finding fault with almost everything
* taking charge without consideration to others
Under extreme stress, fatigue or illness, the INFJ's shadow may appear - a negative form of ESTP. Example characteristics are:
* acting very impulsively, making decisions without thinking them through
* doing things to excess - e.g.: eating, drinking or exercising
* being critical of others, and finding fault with almost everything
* being preoccupied about unimportant details and doing things that have no meaning
* acting in a very materialistic and selfish way
* cutting corners, breaking the rules, and even contradicting the INFJ's own values
Under extreme stress, fatigue or illness, the ENFJ's shadow may appear - a negative form of ISTP. Example characteristics are:
* being very critical and find fault with almost everything
* doing things to excess - e.g.: eating, drinking or exercising
* asking for irrelevant information
* ignoring others' feelings
Under extreme stress, fatigue or illness, the ISTP's shadow may appear - a negative form of ENFJ. Example characteristics are:
* displaying intense feelings towards others, or insisting on things being done without any logical basis
* being very sensitive to criticism
* having a gloomy view of the future
* attributing unrealistic negative meaning to others actions or statements
Under extreme stress, fatigue or illness, the ESTP's shadow may appear - a negative form of INFJ. Example characteristics are:
* going quiet or withdrawing from people
* having a gloomy view of the future
* having intense negative feelings towards others, which may be openly expressed
* ceasing to adapt to changing circumstances
Under extreme stress, fatigue or illness, the ISFP's shadow may appear - a negative form of ENTJ. Example characteristics are:
* being very critical and finding fault with almost everything
* becoming bossy and ignoring others' feelings
* having a very pessimistic view of the future
* see hidden meanings that are not really there
Under extreme stress, fatigue or illness, the ESFP's shadow may appear - a negative form of INTJ. Example characteristics are:
* go quiet or withdraw from people
* have a gloomy view of the future
* openly criticise other people
* stop adapting to changing circumstances
Under extreme stress, fatigue or illness, the ISTJ's shadow may appear - a negative form of ENFP. Example characteristics are:
* having a gloomy view of a future
* suggesting impractical ideas
* acting impulsively, and changing things without any thought
* having intense negative feelings towards others (though these might not be expressed)
Under extreme stress, fatigue or illness, the ESTJ's shadow may appear - a negative form of INFP. Example characteristics are:
* withdrawing and wanting to be alone
* having intense emotions, that may or may not be expressed
* being very sensitive to criticism
* attributing unrealistic negative meaning to others actions or statements
Under extreme stress, fatigue or illness, the ISFJ's shadow may appear - a negative form of ENTP. Example characteristics are:
* being very intolerant of others who do not act competently
* suggesting impractical ideas
* being critical of others, and finding fault with almost everything
* having a gloomy view of the future
* being argumentative
Under extreme stress, fatigue or illness, the ESFJ's shadow may appear - a negative form of INTP. Example characteristics are:
* being very critical and finding fault with almost everything
* having a pessimistic view of the future
* suggesting ideas that are quite impractical
* ignoring others' feelings
Oh look, the types have a lot in common under stress, and this could be the worst example of type differentiation I've ever seen. After careful consideration, I've determined that the above is an example of