My favorite thing ever since I was a kid has always been little scale toys, then I imagine I'm 800 yards away and sniping, or calling in artillery.
Little Army Men... set up a battle scene and try to pick off that bazooka before he makes a mess of things.
Dinosaurs... Grazing in a meadow... I'm craving a brontosaurus steak, but she's behind cover... oh no! Looks like t-rex is hungry too! Better take him out first before he ruins supper!
Hot wheels... There's a motorcade approaching... they're not stopping! Take 'em out!!
I've got a 1200fps air gun, so it can make a real mess of the scene. Especially the metal hot wheels. Carnage galore.
I always get funny looks at yard sales as people wonder why the large bearded man is buying all their children's unwanted toys. Even WEIRDER looks if I tell them why, lol.
My new favorite thing is happy meal toys. These stupid "minions" and "talking Toms" and now "sing" characters my kids get in their happy meals. They all repeat some annoying two word phrase over and over and over and over and OVER AND OVER AND MAKEITSTOP!! So when I (and the kids) have had enough, we go down stairs, clamp the offending toy in, and start shooting. The neat thing is, they're all pressure sensitive switches, so any hit that doesn't destroy the voice system, just sets off the voice.
It's absolutely hilarious to see a minion standing his ground in the face of the barrrage, shouting back at you after every shot, slowly being torn to shreds. Bang! "Banana!!" Smash! "BANANA!!" Bang! "BANANAAAA!!!!".