For some reason, Pearl Jam singer Eddie Vedder decided he wanted to drink his wine in a new, special way.

During the acoustic portion of a show in Stockholm on Saturday, Eddie Vedder took a fan's shoe and poured some of his wine into it.

Then, he drank the wine.

We're not exactly sure why.  But, we echo drummer Matt Cameron's reaction.

Vedder's been mixing it up on Pearl Jam's European tour.  They recently covered Let It Go from the Frozen soundtrack.