A man puts his soft penis in a glass bottle
(preferably Corona), gets it erect, then cracks the bottle
over a hard surface. The surfaces may include anything from curbs to a woman's head.
Miguel: "Yo Rico, what did you do for Cinco de Mayo?"
Rico: "Aye B, we made some Mexican firecrackers
and lit 'em up GOOD! My dick still hurts!"
John blindfolded me and said I should
do a Mexican firecracker. 5 minutes later, I had glass shrapnel in my balls.