Hollywood actor Ashton Kutcher has been scared off driving in the U.K. after a "terrifying" experience in London earlier this year (13).

The Butterfly Effect star spent some time visiting friends in Britain at the end of the spring (13) and decided to shun chauffeur-driven cars in favour of getting behind the wheel himself to try driving on the left side of the road.

However, Kutcher, who is used to driving on the right in the U.S., struggled to navigate his way around London and found himself getting stuck in traffic circles, aka roundabouts.

During an appearance on U.S. morning show Live with Kelly & Michael on Friday (09Aug13), he said, "I decided to drive this time and it was absolutely terrifying. I felt like I was on National Lampoon's Vacation... 'cause I kept getting into those circles (roundabouts), and you can't get out of those circles! I don't know what the etiquette is to get out of the circle, and one time I got caught behind a horse and carriage driver and there were people coming from the wrong way!

"Like, you think you know how to drive, go to London - you don't!"