Tfw shoot red cylinder in game and nothing happen.

Doom 2 map 23 named "Barrels o'fun". If you played it you remember it.

Bonus activation when your friend is standing right beside it

One of my favorite COD maps I worked on was in BO6, it was a border checkpoint with lots of cars that would explode with enough damage. But if one car exploded, it was close enough to cars near it that it would trigger chain reaction explosions. We reported it as a bug, they returned it with Will Not Fix, and then changed it when the sweaty players started complaining after the map went live

Sometimes it's frustrating in games where I want to save ammo and travel very quickly through an area, but in HL series and Garry's mod it was perfect.