Some Japanese students came over as a group and I, among a bunch of others, were invited to a house for a "sushi party." I saw this as an opportunity to practice my (limited) Japanese.
Being a vegetarian, I asked my teacher to help me say "I don't eat meat". I got "watashi wa niku wo tabemasen." Well, during the party, and I admit I was a little nervous, it came out as "watashi wa neko wo tabemasen." I got some giggles and once I figured out what I had said (I don't eat cats) I was a little red-faced to say the least.

Anyone else care to share?
-ken