Pop diva Elton John threw one of his infamous tantrums Friday, making a watery mess onstage and tossing a stool while hinting that heads were going to roll.

Stagehands at the Colosseum, home to his “Million Dollar Piano” show, were seen mopping up water four times. John, 65, would take a drink from a water container, then angrily splash it onstage.

A smattering of boos were heard during his blowup.

During the series of outbursts, the Rocket Man appeared to be angry at his management team, suggesting in X-rated language that someone was getting “(bleeping) fired,” a backstage spy said.

“He made an ass of himself,” the source said.

The six-time Grammy winner started his Caesars Palace show 20 minutes late and ended it about 25 minutes early, according to the source.

Near the end of the show, showgoers were allowed onstage to dance to “Saturday Night’s Alright (for Fighting),” but the band stopped abruptly and the people were ushered back off stage.

John came out onstage for the finale, “The Circle of Love,” and then left the stage.

The audience gave him an ovation for about five minutes, hoping for an encore, but he didn’t return.

“Not a word to the audience or a thank you to the band,” one of the sources said.

His latest diva behavior may have been costly. The show was being filmed by almost a dozen cameras. A dancer posted a tweet on her Twitter feed saying she was shooting a video with the singing legend.