htfu, ha.
I look at that shot and I think, mmm his chain looks a little slack, but thats real good mud clearance on the rear fender....and oh wait, hes pulling an Airstream!
and yes Nun, sniff sniff, methinks the same.
A slight technical observation -- the chain is taut across the top run, which is what counts. The bottom run can be as slack as you like (but in line) and that's what helps derailleurs do what they do.