Ashton Kutcher, it turns out, is really sensitive about his work.

Kutcher appeared on Jimmy Kimmel last night to talk about a whole host of things, but when Kimmel got around to talking about Kutcher's takeover of '2 & A Half Men', things got a little heated. Some back story?

Since Ashton took the helm of the show after Sheen's breakdown and subsequent firing by showrunners, Charlie hasn't exactly been his biggest fan and has repeatedly tweeted dissing his performance.

Kutcher had here-to-fore remained silent on the issue, but last night when Kimmel brought it up, it seems like he finally snapped, exclaiming: 'Dude, shut the fu*k up! Seriously, like. Enough already. Like it's like three years later and you're still blowing me up on Twitter. Like come on dude, really?'

Expect Sheen blow back in 3... 2... 1...