Key-chain gun that can actually fire

Pew-pew-BOOM!

can you imagine accidentally shooting yourself in the dick with that... and then they have to go dig it out. If that wasn't bad enough, think about if it hit the sack and then in a nut... and then they had to dig into the nut to get it out.
Oh god, I'm so sorry. I'm SO sorry.

What is that, a gun for ants?

I like how the gun's so powerful that the can explodes before the hammer fully drops.