Any effect, from invisibility to size change, from dehydration to the ability of flight, can be conveniently placed into a gun that can be fired easily, bestowing its effect, no matter how impossible or unbelievable, on the target.
A few good examples for these are fire guns, disintegrator rays, freeze rays, growth rays, ray guns, teleportation guns...the sky's the limit.
- Despicable Me: Gru has a freeze ray which he fires at people in order to get ahead in line.
- He also has a disintegrator ray which Edith accidentally fires at Agnes' stuffed toy.
- Vector has a shrink ray.
- Mega Mind: Megamind has a gun that can turn the target into a dehydrated cube, which can be returned to normal form when put in water.
- He also has a gun that can give the target the super powers and take them back.
- Phineas and Ferb: Doofenshmirtz has a lot of these. Most of his "inators" are guns with strange effects, like causing the target to multiply, deflate, dance out-of-will and even had one that turned metal into broccoli.