"Charlie, this is a support group. You're the only one who pretends it isn't."
While he was essentially just sitting there drinking and smoking, it is still a big deal to get Sean Penn on a sitcom, and for him to humiliate himself the way he does here. Elvis Costello and Harry Dean Stanton were two big scores here as well. The episode was pretty funny. Both Charlie and Alan were great here, and thankfully there was nothing too absurd here. A fast-moving, witty installment, I just could do without all of the diarrhea and bran jokes Chuck Lorre loves to include.