How about filling their ear with hand lotiion when they fall asleep on the way home after fishing all day?

My "friends" know better than to fall asleep, if I have to drive home whle they are snoring. You just simply wait for them to start snoring, hold the lotion tube about an inch from their ear, and squeeze like hell. If done properly, you can empty the whole tube in their ear canal. Their first instinct is to dig in their ear, which packs the lotion in even tighter. It takes several days to wash it out completely.
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The best way to be succesful in life is to keep the people who hate you away from the people who are undecided