What would be a good joke to play on my boyfriend?

He plays one on me sometimes and I can't think of any on him. I tried doing the ''I think you have a flat tire on your car'' but he already knew that was a joke. He never goes too far with his jokes though. He knows what I would never want as a joke.

A couple days ago he put big, plastic fake tarantula next to me. I woke up screaming off course. I'm getting back at him for that. Guys what would be a good joke to play on him? I suck at jokes. I want a good one we can both laugh at afterwards.

What would be a good joke to play on my boyfriend?
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