Free Jamba Juice

A recent evening, I went to Jamba Juice. The guy who made my drink decided not to charge me, waving me away. I wondered why. Did he feel bad for me and my hair, dyed with red highlights? Or was it because the store was closing for the night and he didn't want to deal with money? Or did he think my hair was awesome? Or perhaps there was Stanford loyalty at play? (This was a Jamba Juice near Stanford, whose color is cardinal, and my hair was red.)