In An Instant (2015)

S6E20 Curtain Call at Bedrock

Fred declines the leading role in the PTA production of "Romeorock and Julietstone" alongside Wilma, prompting her to choose Barney as his replacement. However, Barney pretends to have the mumps and backs out, leaving Fred no choice but to step in. Just when things seem settled, Wilma gets laryngitis and has to withdraw, which brings Barney back into the mix—this time as Julietstone!