Need inspiration? Use one of these suggestions:
I'm not saying I invented the t-shirt cannon but I was the first person to use it for good. 
When the flag says "bang" but the gun says "pew-pew" 
I am the master of my own gun locker! 
Guns, lockers and flags? What kind of science fiction is this?! 
When you find out guns can be used for laughs 
When you realize you're not a TV show character anymore 
When you learn that guns can be used for comedy 
Dean Winchester: Making gun safety cool again 
Nothing like a bit of Supernatural gunfighting 
When you realize you're not in the TV show anymore 
Dean Winchester: Making gun safety fun 
When you realize you're not in Kansas anymore 
Time to put the science fiction skills to the test 
Who needs special effects when you have a bang gun? 
When you have to take action but don't know where to start 
When you realize you can't just talk your way out of this 
Let's hope no one gets hurt in this Supernatural adventure 
So that's what a bang gun looks like 
Looks like I'm in for some science fiction adventure 
Bang! Pow! Boom! Time to have some fun! 
When you realize that a flag and a gun can be funny 
Let's shoot some funny bullets! 
Who knew there was this much action in Supernatural? 
When you thought Supernatural was just a TV show 
When you realize that Supernatural isn't just a TV show 
When the flag says "bang" but the gun says "pew" 
Time to shoot some funny bullets 
Ready, set, shoot! 
When you have to take action but don't know how 
Dean Winchester: The one with the bang gun 
Looks like I'm in for an action-packed adventure 
When you find out that guns are real life 
Bang Bang! Pew Pew! 
Pew-Pew! Bang-Bang! Time to get shooting! 
When you realize that guns can be funny too 
Ready, aim, fire! 
Nothing like a bit of gunplay to get the blood pumping 
When you realize your science fiction fantasies are real 
Dean Winchester: When Supernatural meets science fiction 
When you find yourself in the heat of the moment 
Nothing like a bit of Supernatural action 
When you find out you actually have to shoot 
When you thought it was just a game 
When you realize you have to take charge 
That's why they call it science fiction! 
I guess this is what happens when you mix action and science fiction! 
When the flag says "bang" and you don't know what to do 
When the flag says "bang" and you know what to do 
Who knew guns could be so funny? 
When you thought the gun locker was just for show 
Dean Winchester: Supernatural and Dangerous 
When you realize that bangs and pews are real