Less Offensive to Ears Than Leaf Blowers...

Al Sharpton
Vuvuzelas
Sean Hannity
Kars for Kids jingle
Sonic booms
Mike Mayock
Nails on chalkboard
Whining
Steve Carell
Explanations of college football playoffs
Suzyn Waldman
Subway car air brakes
Julianne Moore accents
Dentist drill
Nicolas Cage
Do-wop
Bill Maher
Bagpipes
Jay Z
Jargon users
Gilbert Gottfried
National Anthem balladeers
Stephen A. Smith
Aid raid sirens
Kenny G
Accordions
"Cotton-Eyed Joe"
Lisa Kudrow
Super Bowl half-time entertainment
Jason Segel
Sabermetrician utterances