There's this old split-screen real-time worms clone called liero, it has rifle weapon that allows this in-game.

They play with reload times set to 0, so this is a little extreme, but just to give an idea:

https://www.youtube.com/watch?v=C6rfXFyssbE#t=695

This game is great BTW, very playable, strange that nobody did html5 online clone.