The 40-yard dashes begin to show up on Twitter

Last night, we pointed out that the folks at NFL Network are encouraging folks to run the 40-yard dash at work, which Rich Eisen will do for the eighth straight time, in suit and tie, at the 2012 Scouting Combine.

The videos are starting to show up, and we’re starting to wonder when NFLN will eventually wish it had added a “do not attempt this at home . . . or at work” disclaimer in fine print at the bottom of the call to action.

The funniest video we’ve seen so far is funny primarily because the guy who sprints across a parking lot ends up wiping out onto the pavement.

The impact really does sound painful.