Where do imaginary friends go... when they're forgotten?

[taranchula]

When the show debuted a few years ago, Lauren Faust (Head Writer and Co Creator) said in an interview that she and the other writers wrestled with the very subject of death and what happens to an IF when they pass away, but then decided that it would be too much of a touchy subject to fully explore, so they thought it would be for the best if they didn't go there. Which is good because it would have led to some very depressing episodes IMHO.

Not to say the whole mortailty thing hasn't been brought up in smaller doeses in some episodes, IE characters put into life or death situations and worrying about going to the boneyard.