My wife is a very good example of an ISFP, but she doesn't use spoonerisms, non sequiturs and mixed metaphors. Maybe non sequiturs, but not intended as serious communication. Her use of Ni tertiary was non-utilitarian. It involved word-play of a sort that playfully yet skillfully strings words together in a humorous way that often rhymed. It's hard to think of an example, but I recall how she used to delight in it.Introverted iNtuition
Tertiary intuition works best in the background of the ISFP's inner world. Perhaps this is the source of the "gut feeling" SPs consult in matters of chance. However "lucky" the ISFP may be, intuition as a means of communication is a poor servant, evidenced in spoonerisms, and non sequiturs and mixed metaphors.