Or how about....
When that child-proof seal seems to be you-proof.
Kids who disrespect their mothers in the supermarket.
Mothers who let them get away with it. (It just make me want to take off my shoe and...)
Someone finishing the leftovers you were saving for later.
Pouring a great big bowl of cereal, only to discover there's no milk.
You find a station with really cheap gas ($1.57 nowadays), but all the regular pumps are out of order.
People who have the nerve to say "I didn't know you were smart." to me!
Like I said I could go on forever!
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The most virtuous of all men is he that contents himself with being virtuous without seeking to appear so...