pretty much anything that might resemble someone inflating...
here's mine:
ever been in a place just minding your own business...
then someone just decides to stretch? like, their entire shirt just rides up their stomach revealing their entire midriff and you can't help but stare? i can't be the only person that enjoys this...
it makes me imagine their clothes riding up their stomachs as they swell up and expand... /-^
Pregnancy I guess... seeing someone's belly grow larger over the months makes me wish I was female. I wouldn't just get pregnant to "inflate," there's a lot more to it than that... but the gorging tummy would be a bonus.
Though it's just a shame that both belly inflation and the possibility of me getting pregnant are fictious... That's why I resort to inflating in the shower!