In an interview with the Hollywood Reporter, Pat Sajak said:
Vanna and I would go across (to a restaurant across the street) and have two or three or six and then come and do the last shows and have trouble recognizing the alphabet. They’re really good tapes to get a hold of. I had a great time. I have no idea if the shows were any good, but no one said anything, so I guess I did OK. I would be hesitant to have anything to drink now.
Here’s a bonus video of Pat chugging something. Who knows what.