OK, OK, so I'm not really certain if it is officially a Hanukkah "ritual," but I have never witnessed this before tonight.
Leaving a grocery store in Wilmington, Delaware on Monday night, I witnessed a parade of automobiles (mostly SUVs) with menorahs on their roofs, driving through the parking lot with horns honking, and wishing a "Happy Hanukkah!" to all.
If you can shed any light on this, please do so.
Follow Mike Opelka on Twitter - @stuntbrain