Admitting that "you can't be too careful," Ashton Kutcher went on the Late Show with David Letterman Wednesday night wearing a helmet and bulletproof vest with a "Not Dave" sticker across the front of it.

Last week, a Jihadist posted an video online that violently threatened Letterman because he's previously made fun of al-Qaida leaders.

The 33-year-old actor was on Dave's show to promote his new role on Two and a Half Men. With his SWAT gear off, Ashton admitted that he's feeling very good about the show's future success. "I think it’s going to go through the roof, I really do. I’ve been laughing really hard," he said during the interview.

We have faith in you too, Ashton - even though you wore a bow-tie last night.