Corrected entry: At the beginning of the movie when Spooner and the Chief is at the bar, Spooner get up and says "I have to take a raincheck" and then picks up the tab for the beers. He pays for 2 beers but there was a total of 3 beers consumed. 2 by Spooner (The robot takes one away and gives him 2) and 1 by the Chief.
brentwpb
4th Jan 2006
Correction: No mistake. He only pays for his own beers. Or he could have already paid for the first beer he drank.
Soylent Purple
He says "here let me get that" and pays - it's likely that he paid for his first round before the chief arrives.