I tend to say something different every time I'm asked... Sometimes I'm serious, sometimes I'm not. Depends who I'm talking to. *shrug*
A few things that have come out of my mouth...
Why am I vegan? Well, BECAUSE:
"Being hungry isn't an excuse to kill or torture an animal."
"I HATE vegetables. I want them all dead. If I took even one bite of meat, that would mean a carrot is free to live another day. I won't stand for that."
"Slicing a kitten's throat to eat it would be really unnecessary and douchey, right? Well, I happen to think it's just as unnecessary and douchey to do to a chicken or a cow."
"My other option is to eat decaying flesh and drink breast milk from cows."
"I lost a bet."
"I can read and comprehend basic math."
"I am quite fond of a number of children on this planet, so I figured I might as well stop destroying it with my lunch."