"It's a very special moment, " said Nadal of the crowd's decision to break into song.

CNN: Djokovic mourns first coach and 'second mother'

Some wine societies are almost as secretive, although their members are less likely to employ a special handshake than they are to break into song.

WSJ: A Peek Into the Exclusive World of Wine Societies | On Wine by Lettie Teague

Though the primetime series deserves points for originality, only 7.8 million viewers, on average, tuned in to see Jackman and co-star Melanie Griffith break into song.

FORBES: The Year's Biggest Celebrity Failures (So Far)

He did not break into song, but he looked fit enough to persuade most fans to want to part with their cash.

BBC: Michael Jackson: Still King of Pop?