Final "How I Met Your Mother" scene filmed 8 years ago

Producers filmed the climactic scene of CBS' "How I Met Your Mother" finale eight years ago, fearing the actors involved would become unrecognizable, and have kept it under wraps ever since.

The Monday-night comedy concludes after nine seasons on March 31 with a one-hour episode.

The comedy's central conceit is that it's a story told by actor Josh Radnor's character, Ted, to his teenage children about how their mom and dad met. The children, played by David Henrie and Lyndsy Fonseca, were depicted in the series' early days sitting on a couch, shifting uncomfortably in boredom as their dad narrated the long-winded story.

Although the mother, played