Resident Evil – Operation Raccoon City: Bertha’s First Aid Spray Trick
If you play as Bertha, one of the perks is that she carries a first aid spray. Now, aside from not knowing what this actually is in the real world (like the magical Left4Dead pills that fix you for a short while), in the game world this is actually rather handy. You should upgrade Bertha to carry the spray from the first time you load your game, as it cannot be done afterwards easily. This is really sensible because if you have her in your team then she can heal you with the spray when you are injured and have no way of healing herself. What you need to do (as long as you are in Veteran of Profession mode) is Kill Bertha and then revive her. She will instantly use the spray on you when she respawns and a glitch means that you can do this as often as you need. Sweet huh?