I had wondered whether Selma was dancing with a real snake because she has a snake phobia:
"I did From Dusk till Dawn, but Robert didn't tell me I had to dance with a snake, because he knew that it's my greatest phobia ever. And so, I was really intimidated [for that scene], because all the other girls in the bar were professional strippers" wmagazine.com
Snake dance youtube.com
My favorite, even over Asians. Those that know me know that means a lot!