A gaggle of posters

From Aeronova, behind the back!From Crazy Alien, a crazy human...
From Crazy Alien again, a crazy alien!
From T3h J00, "muahahahaha!" says Gravity!
From xXnintendorkXx, my favorite medal...

The Poster of Champions!

From Flame254, beware the glowy white afro of doom! From funkdude, a little-known part of a Spartan's training...
From muffin picka, truth abounds, although bullets are a little different than sticks...
From Sylux77, who needs physics?
From Sylux77 again, I dunno, it's very tempting...

Not with a bang, but a poster...

From Ct1 Puck, here's a nice liberation straight to the face! From GenericOverusedName, what anti-gravity should be used for...
From hippiesurfer, more like "only deadly without a driver."
From NerdmanD0tC0m, momentum is a terrifying thing...
From slayer829, if one hits you, you are DEAD!

HollerGamer10's Greatest Hits

"I don't know what's happening here!?!"That would be an awesome Olympic sport...
Ghost Rider claims his rightful throne...
Oops, you bwoke the gwavity machine!
"She turned me into a newt...I got better..."

"There's no crying in poster-making!"

From Kingblack six, Hornet beats physics!The next three are from prototype MTS.

To be fair, why on Earth does a warthog need to be in the mancannon?
Mess with the 'Hog, you get the tusks!
Deadly when empty.
From SockPuppetEater, "His suit could've absorbed most of the shock."

Darkseide's Greatest Hits

The Forerunners were still working out the kinks in the making of artificial ringworlds."To be, or not to be..."
You'd better hope he forgot his shields.
So close and yet, dead.
*Doo-doo doo Doooooo!* You Got A Spike Grenade!