Susanna Reid had no idea. She thought the question was perfectly fine. This despite Downton Abbey actor Dan Stevens bursting into a fit of giggles and some of the 'Good Morning Britain' crew yelping from behind the cameras.

Dan StevensDan Stevens couldn't help himself

So what was the question? Well, Stevens is in a new movie titled 'The Guest'. It's a relatively big American part and of course Reid wanted to know whether Stevens had pipped a couple of high profile stateside guys to the role.

More: check out our Susanna Reid pictures

"This [role] is you as an all-American and a big opportunity for you in Hollywood - you must have had to beat off a lot of American men," she asked. And that was it.

"Why does that make you giggle? Did you not have to beat them off? With a big stick?"

 It was left to poor old Ben Shepherd to try and rescue things, "I imagine there were a lot of other men up for the role as well?" he asked. Stevens continues to laugh before Reid asked him to "compose himself."

Anyway - The Guest still has a 100% rating on Rotten Tomatoes.

"An effectively bloody, breakneck ride, given an extra coat of alluring gloss by the John Carpenter-influenced 1980s styling that is currently all the rage in the genre," said Guy Lodge of Time Out.

"In Wingard's fun, genre-savvy thriller, the post-9/11 subtext proves the most insidious interloper," said Anton Bitel.

The Guest is out in UK cinemas on Friday (September 5, 2014)

Check out the trailer for 'The Guest':