This. I'm showing a film at the cinema and have nothing better to do.
You're so sweet, odeon.
I am?
You said that you came on I2 because you have nothing better to do. That's not normally the sort of thing one hears in a social situation. It's funny because it's true.
"I'm hanging out with you because I have nothing better to do."
"I'm going to your party because I have nothing better to do."
"I'm dating you because I have nothing better to do."
"I'm visiting all of you on this internet forum because I have nothing better to do."
The phrase doesn't translate well to other situations.