The age-old problem: You've got a three-word message but a group of four friends. How do you solve this? One solution is to kill the fourth friend. Trevor's been kind of annoying lately anyway. But everyone calls you "The Fantastic Four"* and, well, "Fantastic Three" just doesn't sound right.
Another solution is to spread out the message. LET'S GO BUCKS could become LET 'SG OBU CKS. Or you could do each of the words on the first three signs and put a "!" or even "!!!" on the fourth sign. Or why not "LET'S GO MILWAUKEE BUCKS"? Sure, you're already in Milwaukee and that part is obvious, but there's no harm in clarity.
Or you could just let Trevor do whatever he wants and end up with a fourth sign that reads "...Yay! I'm the extra sign." and totally dilutes the power of your message with self-serving nonsense. Fucking Trevor, man.
And wait, what about that guy all the way on the right? Is he with them!? This is a disaster.
*Note: No one calls you this
(Tip of the hat: Ananth Pandian)