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

I'm thinking of a prank that will get him but in the end we can both end up laughing. I already know a ''I cheated on you'' or 'fake pregnancy'' is obviously going too far and then all those 3 years of trust goes to the trash.

At the same time, I don't want a lame ''your shoes is untied'' or ''you got a flat tire prank'' that'll be so obviously and he's going to know immediately it's a prank. It won't create the same laughter.

So what would be the middle ground, a good prank to play on him that's not too easy/lame nor too serious enough to cause a break-up either? Any ideas. I can't think of any.

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