"...if you are in a fight in a bar and you really must break a bottle, do it with an upward swing against the overhanging edge of the bar. Then you can simply continue the upward movement and stick in your assailant's face. Smashing it downwards wastes a precious second"
And being an IT Pro, I guess that is something you came up with after a thought exercise carefully considering all the possible actions and outcomes... right? Definitely not from practical experience.... yeah?
Erm....