Because they're always the life of the party!
You guys have no life!
He had no leg to stand on.
They'll tell you.
A pitcher filled with margaritas!
In the first, you must drink a lot of liquids before battle, but in the latter, you only pretend.
He never got no respec. *edited to make grammar worse
A bad judge of character.
He was a little shellfish.
You're a lizard Harry!