[Ok, now he really does laugh, giving the Doctor a reassuring pat on the back] I'm kidding, really I am. I was referring to the properties of alcohol to kill liver cells over time.
How about I buy you your next drink? [poor guy, Charles was telepathically making the bartender think he had just ordered a Shirley Temple and soon the bright red drink was set in front of the Doctor] You might like this a bit better.