Things that make me giggle.
For the purposes of demonstrating precisely how ridiculous a piece of historical hyperbole is, Jen figures out how many people you have to kill to soak Jerusalem in blood.
Couple points her commenters forgot.
1)If you assume that the Crusaders killed EVERYONE in town, the majority of the people would have been killed in their homes. Most civilians would be hiding out behind locked doors, praying that the sack would not last too long. So you can't assume that everyone was in the streets and arbitrarily reduce the square footage covered in blood.
2)Not only does blood clot, but it dries. If left in thin layers (such as blood spattering usually creates) then it will not form into a pool, but a stain.
3)Few people bleed out completely unless hung in such a way that their injuries are at the bottom.
4) De Gesta Francorum et aliorum Hierosolimitanorum, from which the quote was taken, was written a few years after the fact as a piece of war propaganda sponsored by Bohemund I of Antioch. It's anonymous author was criticized by people writing at the same time. Guibert of Nogent wrote his Dei gesta per Francos (1108) based on it, saying the original "frequently left the reader stunned with its insipid vacuity." The bit about riding through streets up to the knees in blood is a bit of lurid imagery intended to motivate follow-on Crusaders, not a literal description. There is not a serious historian who believes anything of the sort happened.
On a totally different note:
The TSA's Permitted and Prohibited Items List. The astute reader will note that 4 oz. of Personal Lubricant is permitted. So it's OK, folks. If you want to join the Mile High Club, the TSA will not stand in your way.