When an evil enemy nation invades by dropping innumerable legions of soldiers via parachute, they're only a threat if three/four of them land on the same plane of axis. (Paratrooper, or whatever it was called when renamed for your area)
Apparently Nuclear weapons are incredibly destructive now matter their size (any modern setting shooter) but you can conveniently have one disguised as back molar to blow through the bars on a holding cell aboard an alien mother ship (Duke Nukem 2)
Any evil empire's air force use the Kung-Fu movie henchmen's guide to combat as their tactical doctrine. Dancing about the screen firing randomly, before shifting directly into incoming fire. (Raptor, Zone 66, just about any plane shooter type)
A plumber is the most hazardous and demanding occupation anybody can do (If you can't guess this, there's no hope for you)
A shark is not only capable of breathing out of the water, but also a very talented driver of a go-kart (Wacky Wheels)
Human beings can project fire randomly from their hands when fighting (Mortal Kombat, Street Fighter)
Children can leave home if they intend to commit their lives to raising twisted parodies of real animals. (Pokemon)
When a small party of alien's attack a excellently equipped military base, they will slaughter 99.9999% of the population in two minutes, and yet be wiped when that one survivor comes back 2 years later with 2nd hand bionics and a barely functioning gun, possibly because he was mercenary for one of those years (ElectroMan)
In space nothing gets done and all wars are stalemate, unless you hire a mercenary. (Terminal Velocity, Descent, Solar Winds)
A powerful ray gun can't turn everything into retarded versions of itself.
Pogo sticks let you bend most of the laws of physics regarding movement and gravity.
Pogo sticks are easy to use and fun.
(Commander Keen)