Bagpipes! The tune bit is Ok but that constant droning gets me like some people hate fingernails on a black board!
We have one busking* piper** who plays in Darlington town centre on a regular basis. If we were all allowed to murder one person in a lifetime with no comebacks he'd be pushing up the daisies now.
* Not the adjective I'd usually use, but used so as to not frighten the horses, children and those of a nervous disposition.
** Played in Scotland they are wonderful, and best heard from Darlington, or further South, like South Africa!