6) Leave a bunch of XXXL condoms around for him to find. Reassure them that they're not for him, just leftover from an old boyfriend. Then present him with "normal" sized condoms for his use.
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8) Make an utterly disgusting meal for him, his mom, best bud, et cetera. It's the thought that counts, right?
9) Tell him you cheated on him. With someone completely ridiculous, like your landlord or your gay best friend. (Note: If you have had or would like to have an affair with either landlord or gay BFF, probably best to skip this one. Pranks are only funny when the end result is relief, not suspicion.)
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10) Fake a positive pregnancy test result and leave out for him to find. When he asks you about it shrug "So?" as you light up a cigarette and pour whiskey in your coffee. Classic. Advice: I Am Always Scaring Guys Away