Spengler: "There's something very important I forgot to tell you."
Venkman: "What?"
Spengler: "Don't cross the memes."
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: "Right, that's bad. Okay, all right, important safety tip, thanks, Egon."