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A jackassident happens when one dumbass hurts another dumbass because they're both too stupid to realize they're both dumbasses.
My brother tried to flip me off while driving. He missed. I got hit by a mailbox. He got a ticket. Classic jackassident.
My friend drank a whole bottle of tequila and tried to dance on a table. The table broke. He fell on me. Jackassident confirmed.
My mom yelled at my dad for eating my lunch. He threw a fork. It hit her. Jackassident achieved.