Me too! I still find things like burps and farts oh so funny and will crack up big time over it. Some people might just giggle at a fart for a minute or so, I will often land up on reems of laughter lasting as long as I see fit
I used to think it was hilarous to load the wheelie bin up with allsorts of liquids up until about age 15, making the bin so heavy sometimes the dustmen wouldn't take it! I thought it was a bonus if they didn't collect it lol. I once filled it with weening milk my mum had bought for some baby guinea pigs, which caused it to stink, I also thought this was hilarious.
I had a facination with the bin, it was really dumb, I would put parcel tape on the lid to strap it down so when the dustmen tried to empty it, they'd not be able to get it to open in the back of the wagon lol.
Another one I had was my 'waterbutt worm factory' where I polluted my mum's water vats which she used for watering the garden with rotting fruits and vegetables, so the water would get a thin film on the top where flies would lay their nymphs, which I named 'buttworm' which would dive down when I kicked the tub, I of course found this extremely funny. The water stank and killed anything it touched
I've always laughed at the most stupid or obscure stuff, and partaken in it.
I also collect childish items like 80's trolls and plastic dolls and still laugh at some of this stuff when I recall it.
I am 25, I can act my age, but sometimes I simply choose not to hehe. I think this is exasserbated by my AS, but not caused by it. Everyone does stupid stuff, just look at these students who are on highly acclaimed courses at highly rated universities, who roll through the streets half naked, wearing stupid outfits and vomiting & urinating all over public places. This 'fun' seems to be more socially accepted than telling someone you did the things I mentioned above and still find them amusing now.
A lot of what so called adults find 'fun' I find really pathetic and totally unamusing. People often find fun and amusement at someone elses expense, which I never ever do or did, with the exeption of a few pissed off dustmen!