Boss Battles Thread

I learned a couple things using the energy drink:
The energy drink gives a random addition of HP, I used 5 drinks to get it to just over 13k HP (1st went to 9k, 2nd 10k, 3rd 10.5k, 4th 11k, 5th 13.3k) I used a 6th one because the 5th was about to run out, and it lowered my HP to 12.6k. If you look at my HP bar, you can see I have more hp then my max hp, and when I was hit, it kept the 13k HP. Odd.

Is that HP drink a new item, and if so, is it a CS item or something actually obtainable in the game?

And just for a bit of nostaglia, the only challenging boss fight I've ever had in the game.

[IMGSPOILER]http://img638.imageshack.us/img638/9725/crogbattle.jpg[/IMGSPOILER]
crogs really suck for a sniper

[IMGSPOILER]http://img52.imageshack.us/img52/4747/killedcrog.jpg[/IMGSPOILER]
This is the first time I soloed a crog on the sniper