Right-Ear Advantage
Marzoli & Tommasi (2009) had a female confederate visit a disco and approach 176 random people asking for a smoke. Clubbers were about twice as likely to hand one over if the request was directed at the right ear, whether or not the clubber was male or female.
These findings confirm previous studies which have found a right-ear preference for attending to and processing verbal stimuli. It is thought that this is because language is preferentially processed by the left side of the brain, which receives its input from the right ear.