People anchored to close?

[Stemar]

You don't need bagpipes, a noisy generator would do it

 

[Blueboatman]

A slappy transom is pretty effective too

 

[mattonthesea]

A pub in Bristol used to play Ride of the Valkyries at full volume at kicking out time. The drinkers all loved it and stayed to listen but the neighbours complained!

 

[Chiara’s slave]

Someone suggested slackening off your halyards and going to the pub last time this came up.