My 13 year old daughter came home wearing a Nirvana t-shirt. I said you can't wear that shirt unless you tell me your favorite song by them.
It led to a 2 month exploration of 90s rock (I guess that's dad rock now...).
Today at volleyball camp, she went up to another girl wearing a Nirvana shirt and said "My favorite Nirvana song is Lithium, what's yours?" to which the other girl had no reply. Proud dad moment.