One Of These Things Is Not Like The Others...

One of these things just doesn't belong...

Hints:

I WANT to do two of these things.

Two of these things are FUN.

Two of these things are PRETTY.

I won't be working on two of these things tonight.

One of these things is NOT pretty... or fun... and I don't WANT to do it.

I HAVE to do one of these things...tonight...I guess...