Saran wrap his toilet, the put the seat back down. He'll never see it until it's too late.
or
If his kitchen sink has one of those spray nozzles on it, tape the handle down with electrical tape so he'll get sprayed when he turns on the faucet.
or
Tear the labels off his canned food in the cabinet.
or
Leave a dead mackerel under his couch.
I have more.
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