Oh come on you two, that's obviously Ghostbusters, with a reference to them killing the Stay-Puff Marshmallow Man after letting the streams cross.

It's like you folks don't even recognize high art! :P

My turn, going to go with a movie:

A movie within a movie within a movie within a movie. If you get lost, think of your totem (perhaps a spinning top) to pull you back to reality.