I have not been following this but now having read a few of the entries I must say some of them are very funny, some not funny to me. Anything at the expense of someone else is not funny.
it also is not funny just that you fooled someone into thinking that something outlandish is so.
I also wonder that OP called this type of behavior childish.
most children do not do this sort of thing or think of doing.
Some do as do some adults.