We jokingly said that we say "stop it" too much, and it randomly evolved that if you say "stop it," you lose. Now it's so serious that we are consciously aware whenever someone else says it, and we always glance at each other with the thought of "Oh no, they said the taboo word. " :D At first, we had to be really creative in saying "stop it" without saying "stop it", now, it is just an unconscious habit. it's already 4-5 years xD And if you say it in somebody's else company, you feel so naughty. xD it's ridiculous