I often wear earplugs, or at least one ear plug and one ear bud since I like to listen to music while riding. I wear the earplug on the exhaust side and the ear bud on the other side.
Recently I discovered I wasn't wearing earplugs properly. Someone posted this video on another forum and it taught me how to properly put an earplug in.
http://www.youtube.com/watch?v=SPNPZ...layer_embedded