Ignore it if you can. Pretend you're listening to music and ride off. Good luck if he/she chases you..
Something like this: http://www.youtube.com/watch?v=GWOCxj_qvoI&eurl=http://johnprolly.blogspot.com/2007_03_01_archive .
@Eustace started
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Something like this: http://www.youtube.com/watch?v=GWOCxj_qvoI&eurl=http://johnprolly.blogspot.com/2007_03_01_archive
.