in line with the joke above..
this dude's car tyre blew out and he stopped at the side of an asylum where the chain link fence kept the inmates in...
he was attempting to change the tyre and unscrewed the flat tyre.. when he put on the spare, he tripped over the hubcap where the placed the nuts for the tyre and they went into the sewer..
he stood there and wondered what to do...
then he heard from the other side of the fence: dude.. i can solve your problem..
he replied "how?"
the inmate said "take a nut out from each of the other tyres, it should hold until the next service station where you can get help"
the dude said "hmmm.. that's good.. hey.. you're pretty smart.. why are you in the lunatic asylum?"
the maniac replied "man, i'm insane, not dumb!"