Bob's Burgers (2011)

S15E12 Like a Candle in the Gym

While taking a family stroll, the Belchers unexpectedly encounter Coach Blevins, who is marketing candles infused with sweat scents. However, Gene and Louise soon uncover that this is merely a front for Blevins' secretive operation of selling sweat samples for DNA extraction purposes. The siblings must navigate this surprising twist and confront the coach about his dubious enterprise.