Critic goes Post-al on ill Roger Ebert Thursday, September 11th 2008, 4:00 AM The audience at the Toronto Film Festival press screening of "Slumdog Millionaire" didn't know they were also going to get live entertainment Saturday. There'd been lots of Oscar buzz about Danny ("Trainspotting") Boyle's flick, about a poor Mumbai guy who wins a girl and becomes a national hero by going on a game show. So the screening room was packed. Soon after the lights went down, a source tells us, "a man in the audience started yelling, 'Don't touch me!' People looked around and shrugged. Ten minutes...