When both teams Start flaming each other

Then your friend tells you to help him in the argument.

http://2.bp.blogspot.com/-QoPQxqRo12I/T9ENZ5ub9eI/AAAAAAAAC0U/AOzcdRF3GOE/s640/Neil-deGrasse-Tyson-gif.gif

My exact reaction when anyone mentions My Little Pony. Grab some popcorn, enjoy the show