It's an NFL game day in London, which means Londoners are American football fans for the day. And man, they are certainly out in full force at Wembley Stadium for the Dolphins-Jets game.

Chances are, if you do a quick stadium scan, your team's jersey will make an appearance in the crowd. Because when it's an NFL game day in London, you wear your football jersey, even if your only football jersey is a Johnny Manziel Texas A&M jersey, a Donovan McNabb Eagles jersey or an Adrian Peterson Vikings jersey.

You wear it, even if your only football jersey is an Eli Manning jersey or an RG3 jersey.

Even if your only football jersey is a Steelers' jersey or a Boomer Esiason jersey, you wear it.

I promise I'm not lying. There are a lot of jerseys at Wembley.

But none of those jerseys come close to London's best RG3 impression.

Here's a closer look at the NFL fan of the day.

And in other news, London is confused by Fireman Ed.

For the record, Fireman Ed has nothing on that RG3 fan. Maybe that's why they're not impressed.

Is that RG3? (Twitter: @JamesHeuser)