Ты are chewing some gum and all of a sudden..the gum gets a life of its own and jumps from your mouth! This is especially bad if Ты are talking to someone when it happens.
How about this one? Running right into a door that is closed, like one of those glass sliding doors. Ты would be surprised how often this happens. It could leave Ты with a sore nose too!
This one is silly but it happens! Ты re-send one of those silly chain-mails because Ты are so afraid that if Ты don't, something horrible will happen to you.
And finally, at 8am in your first class of the day, Ты feel really sleepy and Ты accidentally fall fast asleep in class. The teacher never likes that one much, especially if Ты snore.
How many of these have happened to you?
