one of the things that i think is gross is when i am washing my hands in the bathroom (at a park or restaurant) and see someone come out of a stall and not wash there hands!!! Yuk!!! That's sooo disgusting!! Another thing is watching a kid put there hands on a trash can and play with it!!!
Ooh!
I agree with some of the other answers like....
-smelly people!
-women walking around in heels (if you can't wear sneakers or flip flops to a park, you shouldn't be there!)
-people smoking!!!!! Gross!!!
-big mouth people who think they are important. (i don't care to hear your conversation!)
-people who and moan!!!!! Get over it!!