A wonderful study in fear this week.  Who is most scary to our Cheers gang? IRS agent Dot Carroll to Norm, the mutant Orioles mascot to Sammy, or a penniless Robin Colcord to Rebecca?  Or maybe a bagful of wild squirrels with sparklers attached to their tails takes first prize.  Order up a couple gin and tonics and enjoy "Norm's Big Audit" and "It's a Mad, Mad, Mad, Mad Bar"! (S11E13 starts