“Now get back to work!” It’s the default joke at the end of many, many Tiny Desk concerts — not all of them, of course, but maybe 400 of them? 500? The band gets done playing, the applause dies down and someone blurts out, “Now get back to work!” It might be the singer or a band member, or perhaps an NPR staffer; Felix Contreras does it a lot, befitting his role as NPR Music’s lovable uncle. And the crowd dutifully, reflexively and/or sincerely laughs uproariously, struck by the discord between the event (a concert!) and the setting (a workplace!). Sometimes we include the line in the published recording; most of the time, we edit it so the applause trails off into silence. To join the ranks of the funniest Tiny Desk concerts, you’ve got to dig a little deeper. In the case of Fragile Rock ‘s 2017 set, “digging deeper” meant rolling out an emo puppet band — complete with puppet crowd-surfing — while Reggie Watts improvised three delightfully funny songs in 2012, even filling one with