Egon : There’s something very important I forgot to tell you.
Venkman : What?
Egon : Don’t cross the streams.
Venkman : Why?
Egon : It would be bad.
Venkman : I’m fuzzy on the whole good/bad thing. What do you mean bad?
Egon : Try to imagine all life as you know it stopping instantaneously and every molecule in your body exploding at the speed of light.
Spengler : Total Protonic Reversal.
Venkman : Right, that’s bad. Ok, important safety tip. Thanks Egon.
(Quotes from the movie Ghostbusters)