They brought back beer? Originally beer was sitting somewhere, your player touched it, responded like they got hit by something, but healed and then walked all awkward everywhere for a period of time.

Before iClassic on the Graal Classic/the Adventure server I had reimplemented that in a custom movement system (simplified the logic a ton and got rid of glitches). Then I made it so that if you drank one beer, it would heal you all at once and set a timer. If you drank more beer it would heal you more slowly each time (and increase the timer). If you binged too much, it would eventually start hurting your health and eventually kill you instead. Some other scripter added an effect where it would change your chat text to be drunk-like, and I'm not sure, but I think someone else also added some visual drunk-like effects.