Bill Cosby was a guest on Jay Leno’s The Tonight Show last night, and he gave a stand-up performance worth sitting down for. The 72-year-old comic icon riffed on getting old and talking on the phone. (All that was missing was: Can you hear me now?) Check out the clip after the jump. Does Dr. Huxtable still have it? Would you pay to see him do stand up (or rather sit down)?