Boo

Something my kids love doing is hiding and scaring people. They hide so well now that it takes up to 5 minutes of searching to find them is a not very large upstairs floor of our house. It used to be that if you had trouble finding them you could just say "Where's Nicholas" and he would call out "Here". But now they hide in closets, under beds and in bathtubs. If you happen to be babysitting them one night, beware, they will hide and they will jump out and say "Boo!". It's gotten to the point where now even my wife is in on the act (this is from the girl who threaten to leave me if I didn't get ride of a motion sensor activated dinosaur that I had hid in a bathroom). Scaring people in general is not well received on my wife's side of the family but it was always part of my upbringing (thanks dad).
The link of this blog will direct you to the character the aforementioned toy was based on.