What is blue but does not weigh very much?

Light Blue

I told my wife she was going to be a great musician, but she didn't believe me.

I guess you could say she was a little off-beat.

What do you call a belt made out of watches?

A waist of time.

So I was at the beach with my family, and we saw a man selling seashells. He had all sorts of shells in different shapes and sizes, and my kids were fascinated by them. The vendor told us that he had been collecting them for years and had become quite the expert

at shell-ing out advice