At my cousin's wedding, my dad (who doesn't much care for his nephew's bride) thought it would be funny to flick his cigarette at her back as she walked down the aisle.

It got caught in her hair and started to smolder.Her father had to get it out while she cried hysterically.
Then he punched my Uncle Raymond, whom he thought had tossed it, right square in the forehead and ended up breaking his own hand.
Good wedding.