Ellen DeGeneres has become a pro at scaring the crap out of her celebrity guests, with Taylor Swift, Carrie Underwood and Kacey Musgraves on her list of victims. On Wednesday's show (May 1), it was Blake Shelton’s turn.

"When do we talk about the fact that I just crapped my pants," Shelton explains just a few seconds after Modern Family star Julie Bowen jumps out of a hollow table sitting between the guest couch, where the country star is seated, and the show host.

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DeGeneres and Shelton had been making small talk, chatting about everything from The Voice to his falling off the stage during shows to their shared love of Cheetos. DeGeneres even went as far as ask Shelton point blank: "Gwen Stefani — are you going to marry her?" before Bowen popped out from the table.

It took longer than anticipated for Bowen to pop out, and DeGeneres was concerned when she finally did. "You've been in there a long time," she remarks when the actress finally shows up. "It's so hot in there."

Turns out, it was Shelton's fault that the prank took so long to come to fruition. "(Shelton) has been hitting on the top of the box with his big beefy hands over and over and over," Bowen yells. "I thought I was going to die, Ellen."

"Julie, I had to get his arm up," DeGeneres says. "The whole time his arm was on it and I was like, 'How do I get his arm off?!' That’s why I had to lean over this way."

Also during Wednesday's episode, Shelton received somewhat of a pre-engagement gift from DeGeneres — a clock showing Shelton and girlfriend of nearly four years Gwen Stefani kissing. She hopes it will get Shelton to propose sooner rather than later, but he did not indicate whether he has plans to marry the pop-rocker anytime soon.

See Pics of Blake Shelton, Gwen Stefani and Her Boys at UglyDolls Premiere: