the real reason for snakebite punctures

Cyclists have been told that a "snakebite puncture" occurs when a tire is underinflated, and the hard rim pinches the tube in two places as the wheel goes over an edge, such as a curb or the rim of a hole.

Balderdash.

Here's the real reason for snakebite punctures:

Lord only knows where the original is from; I got it from Oddman.ca.