A lot of the guns from Get Smart that looked like something else:
Pool cue shotgun
Phone in Max's apartment - dial 1-1-7
Enterprise's
EM-33 Plasma Pistol
MACO Pulse Rifle
Star Trek: TOS
Phaser II
Star Trek: Movies
Assault Phaser
Klingon Disruptor (Not the box ones from IV)
Star Trek (2009)
Romulan Disruptor (I'm guessing it was a disruptor... the one that Kirk takes from the guy)
TNG
Varon-T Disruptor Pistol
Original BSG
Colonial Blaster
U.N.C.L.E. Special (it was good enough to become Megatron... it's good enough for me)
Doctor Who
Captain Jack's Sonic Blaster (though it really needed a spare battery

)
From The War Games: The War Lord's trooper's laser rifles (don't actually know what they were called, because they weren't given a name in the show)
Space 1999
Stun Gun
Batman Beyond
Mr. Freeze's Gun
Tranq Rifle