A small hand pump is very convenient for bicyclists, but can a bike pump be weaponized? YouTuber JoergSprave from The Slingshot Channel gives it a shot.
In the end he's able to get the force up around the legal limit for air guns in Germany, but it's still no match for a rudimentary slingshot. Either way, don't shoot your eye out!
Bonus video: turning a camera into a projectile might not even break them: