Ignoring the "tan" and going with the two flankers looking ready to "hurl"
"Don't cross the streams."
"Why?"
"It would be bad."
"I'm fuzzy on the whole good/bad thing. What do you mean, "bad"? "
"Try to imagine all life as you know it stopping instantaneously and every molecule in your body exploding at the speed of light."
"Total protonic reversal."
" Right. That's bad. Okay. All right. Important safety tip. Thanks, Egon."