50 Cent's poolside performance at the Hard Rock Hotel almost turned deadly.

The rapper ended his show early after part of his stage — and its attached lights — sagged dangerously close to the water Saturday night.

"Back up," he yelled. "You're going to get electrocuted."

The trouble started when 50 threw a fistful of dollars into the air and fans swarmed to collect the cash. They leaned on the stage and it started to give way.

When the cash-seeking swimmers failed to heed his warning, 50 called it a night and walked off stage.