I used to get the ick with really random stuff. I dated someone once who made a weird noise - like a 'ah, ah ah, ahhhh' when he bought a Lord of the Rings DVD. Instant ick. Can't really explain it, just killed it dead.
Another one used the phrase "I want you to *uck me now" to indicate he'd like me to go on top. Said in a baby voice. Nope! instant, never to be recovered ick.
My mum once told me about her dating life before marrying my dad. All very tame but she was brutal with her ick. One chap turned up to take her out wearing a red jumper. That was the ick for her. She went on the date but she already knew there wouldn't be another purely due to this poor sod's jumper. I always imagine this guy getting ready for his date, feeling all fresh in his brand new jumper, not realising it didn't matter how courteous or how funny he was, he was already doomed