I'm not gunna name 5 cause i'll be here forever trying to make the list.
Can't even think of 1...
Technically I haven't smoked a cigarette, but when I was 8ish me, my bro (who woulda been 11/12) and couple his friends went out into the alley behind my house and they had a cigarette, and we passed it round. But when it was my turn (I begged them to let me), I actually blew on it instead of sucking the smoke in. So, I guess i've kinda half-smoked before.
Drink a beer I haven't done. I sipped something when I was like 4 or 5, but other than that not a drop of alcohol has passed these lips. So that's another one, I've never been drunk.
Never had proper sex. Like from the age of 10 onwards I've never seen a girl naked in person.
Earlier I solved a Rubik's cube for the very first time, so thats one I can cross off the list.
OH, I've never actually burped that I remember. Maybe as a baby I did, but I like, physically can't do it. And it's not like I need to but can't, I guess all my gas just goes downwards.