Irish Drinking Song
 

I say a topic and you say the first line of the song!
Example:

Line1: I once at a taco,
Line: Is was so blue,
Line3:It almost made me gag,
Line4: I wouldn't have eaten it
Line5: If only I had knew

↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑
Failed, but maybe you can do better (Remember, take turns doing lines)

The guys on Whose Line Is It Anyways does this really good. I love it.
So what's the topic?