When stubbing one's toe on the way to the bathroom, it is essential to scream: "Foiled!"
It can also be used as a verb.
(i.e when watching a friend fall down the stairs, "You have been foiled!")
Foiled can also be used as ownership to one's actions.
(i.e when discovering you have ran over your neighbour's cat: "Foiled! By my inability to navigate my car!")