Barbra Streisand fans worldwide are clamoring for tickets to the singer's first public defecation since her sold-out Carnegie Hall dump in 1975. 'This is a once-in-a-lifetime event,' said rabid Streisand fan Elaine Waldman, 43. 'To see Barbara evacuate her bowels and wipe her ass live is something I wouldn't miss for anything in the world. It's truly an event.' The 15,000 $250 tickets for 'Barbra: It's Time To Go' sold out in less than half an hour, and scalpers are now asking up to $4,000 for prime seats. In addition to the live audience, the dump will be carried on pay-per-view television. An HBO special on the making of the dump is also in the works. 