After finishing another mammoth set in Detroit on Saturday night, Eminem had one more task before The Monster Tour reached its conclusion.

Hype man Mr. Porter informed the rap legend that he would need to complete the ALS Ice Bucket Challenge at Dr. Dre's behest.

After Em took a seat, tour co-star Rihanna did the honors and poured a bucket of ice water onto Slim Shady, who wasn't very happy about it.

"If this was not for charity, I would be so f---ing mad right now," he yelled at the sellout crowd.

Em then challenged producer Rick Rubin and Porter, who immediately took the challenge onstage.

Theatrics ensued as Rihanna tried to escape the stage.

"Okay, so I've got one more motherf---ing person I can challenge," Em said. "Who do you think that might be?"

Rihanna finally obliged, and then Eminem thanked the crowd by flipping them off. The gesture ended the final show of a brief tour that churned out 50 songs a night for the fans in attendance.

Post by Eminem.

A hometown crowd greeted Em two nights in a row at the outdoor Comerica Park, and MLive writer Eric Lacy made note of the rapper's renewed energy:

This owner of 10 No. 1 tunes on the Billboard charts reminded a few fans that appeared drunk and stoned in the crowd that he's not the erratic, alcohol-filled, pill-popping Slim Shady of old.

"Goddamnit!," Eminem exclaimed before he performed "My Name Is," the first major hit of his career in 1999 "See, I don't do any of that any of that anymore!"

The rapper whose real name is Marshall Mathers reportedly has at least five years of sobriety and looked during a two and a half hour show with Rihanna as happy and healthy as he's ever been.

At 41, with a lean, muscular frame and plenty of energy, there's no telling how long Eminem can keep this career going.

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