loosen up the exhaust clamp, that way when he starts it up it will rattle so bad, he'll be staring at the engine for hours until he realizes it is the exhaust bracket.
LOL cruel....but hey, I've seen this joke done before. I'm a harley girl but if he has a big twin, then his bike doesn't leak. The oil and screws thing would still work. If he has an old evo motor or shovel....it won't work, you might as well just put a pan under his bike and fill it with oil and rice. And tell him his bike was cheating on him.
