inane conversations

While I was googling LGBT issues for Awareness Campaign,

Amy (my now-famous long-suffering roommate)

: Do you support gay marriage and all that stuff?

Me : Oh yeah.

Amy : Why?

Me : Well, everyone's free to choose who to marry.

Amy : ...

Me : And besides, less competition.

Amy : *choke*

I don't know why, but she seems to choke a lot around me...

:D

Can someone please tell me why she choked?