Spengler: Don’t cross the streams.Venkman: Why? Spengler: It would be bad. Venkman: I’m fuzzy on the whole good/bad thing. What do you mean “bad”? Spengler: Try to imagine all life as you know it stopping instantaneously and every molecule in your body exploding at the speed of light. Stantz: Total protonic reversal! Venkman: That’s bad. Okay. Alright, important safety tip, thanks Egon.

Ghostbusters, 1984