Will this HARM a car?

I want to prank my friend who just bought a 1997 camry with 225k miles in "great shape" will it harm the ar in any way to park the car facing down on a hill, then pour some old motor oil into the tail pipe and then run the engine and then show him thats its "burning" tons of oil. Will that hurt... show more I want to prank my friend who just bought a 1997 camry with 225k miles in "great shape" will it harm the ar in any way to park the car facing down on a hill, then pour some old motor oil into the tail pipe and then run the engine and then show him thats its "burning" tons of oil. Will that hurt the car?
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