Three potions on a shelf, each with effects that last until you physically exit the current dungeon.
From left to right:
Shrinks you by one category
Changes your alignment to Chaotic evil
Reduces CON -4
Fortunately, they are clearly labeled.
Unfortunately, the wizard's apprentice did the labeling, and he wasn't terribly attentive, so all the labels are wrong.
Roll 1d3 to determine which label got stuck to which bottle, from left to right.
First roll is 2, so the left bottle performs #2 effect
Second roll is 3, so the middle potion has #3 effect
The final bottle has #1 effect