I agree with the majority that I do not feel that it is funny. I also feel that it can be damaging to a young child's psyche. It is one thing to pop out from around a corner and spook your kid, but to pop a hideous 'monster' type thing at them on the computer or tv, just to see if you can scare them to the point of tears, that is just too sick for my taste.
I am not a fan of the pop up scary thing anyway. I am often afraid that someone with heart problems will watch it and have a bad effect.