When you start speaking to yourself in tongues when walking in the streets, while there are not too many people around.
(I am just experimenting with phonetics though)
When you pretend you are talking to someone in weird foreign languages on your mobile phone as an excuse to do it (see first sentence) when there are actually people around. (I've only done it three times)
4w5 so/sp I 77% E 23% N 85% S 15%
T 51% F 49% J 60% P 40%
average of many test results combined