Party Girl Party Boy

Party Boy or Party Girl (depending on gender) is a perk added to Fallout 3 with the Broken Steel add-on and a main perk in Fallout 4.

Fallout 3
The player will no longer suffer the withdrawal effects from an alcohol addiction.

Bugs
Every variant of alcohol provides a +3 luck bonus that is different for every other variant of alcohol; this means that one can obtain a very high luck bonus by consuming different varieties of alcohol at once.