20 Mind-Blowing Facts You Never Knew About How I Met Your Mother

1. There's A Real Engagement On The Show

After finally seeing Marshall and Lily tie the knot, the two-part Season 2 finale still has one big moment for the gang - Ted and Robin have broken up (blimey, this really was a long time ago). After a case of mis-delivered champagne-with-engagement-ring and a failed escape from a restaurant it becomes apparent that the duo just aren't meant to be together (right now at least).

It's not all down-beat though: that engagement between the couple whose ring Robin accidentally gets was real; it's an elaborate proposal by Timothy Russo, a friend of one of the show's writers, to his then-girlfriend Jana Rugan, much to her surprise. In rehearsals a pair of actors were the original recipients, but once the cameras were rolling Russo stepped in, popping the question on camera. There must have been a lot of pressure to get things right on that first take. ...dary. Legendary!

Are there any other How I Met Your Mother facts you know? Let us know in the comments below.