When you choose a server and login, then when the game says "Ready..." you spam ESC. That makes you leave the game and enter the server browser again. BUT, your character has spawned a "dummy" in game.
If you join the same server seconds later, you stand next to your self.
You can then just shoot your just created dummy, and loot all your things.

This is ruining the whole item scouting aspect of the game, as groups of 2-5+ people just duplicate items across all players.
This encourages even more to Shoot on Sight mentality, because it's way too easy to duplicate everything.