Here's what you do: Take in a Saturday-night show at the Pageant. Grab a drink or three afterward at the Halo Bar. Tip generouslyyou're a bon vivant, after allbut make sure to hold back three or four bucks. At about 3 a.m., go outside. Look around. You'll spot a guy selling hot dogs from a cart. Buy one. Don't expect conversation, however; your vendor is a man of few wordsbut many wieners.