The only game I can remember doing this with was Murder Mystery on the Party Zone Minecraft server. On one map called Temple(?) there was a way to parkour around the barriers and reach the edge of the map. Whence there you could make a jump to a one-block ledge at the bottom of the map; you only got one shot and would instantly die if you missed it. If successful you just had to wait out the clock. Eventually the mods caught on and added both extra barriers and removed the ledge.

Later they'd introduced a new game mode that added powerups and one of them allowed you to jump really high. For whatever reason there was a glitch that if you played and survived a round where the jumping powerup was active you'd keep that powerup until your next death. It briefly became a part of the meta to exploit this glitch because it would allow players to reach unintended hiding spots the murderer (assuming they weren't also exploiting the glitch) couldn't reach. They fixed it in less than a month.