In an attempt to "nurse his inebriated friend" back to health, Fezzik dunks Inigo's head into alternating barrels of hot and cold water, drenching our Spanish Swordmaster quite a bit.
As Inigo explains his plan to find the Man in Black to get his help in his vengeance plot against the six-fingered-man, the scene cuts back and forth between the two friends, and EACH time we see Inigo, his hair is in different stages of drying!