Replying to Ways you intentionally drive people crazy

a friend and i have been in a competition of who can drive the other more insane by subtly annoying each other on random and inconsistent occasions. the only rule being that one can't recognize the fuckboy act the other is doing until it has succeeded. what are some ways that you do this?

i will start:(ideas that worked)
-staring at someones ear while talking to them instead of making eye contact.
-restarting a story you are trying to tell every time you pretend to hear something distracting.
-interrupting a person every time they get halfway through a sentence to ask a completely irrelevant question
-clapping loudly at random times while speaking
-getting multiple unrelated people to ask the other person the same question at completely random times over a two week period. (question was, "have you heard the band(nonexistent), tommy morello and the shingles?"-"no"-"oh well they are awesome"