circledrive

For the lazy, an Australian 600 mL coke bottle is 9.53" (242.1 mm) tall and has a 2.86" (72.6 mm) diameter. The penis would have been ~14.3 inches long and >2.86 inches wide AKA a freakin' horse. Source (with other bottle dimensions in case you ever need those): http://69.129.141.51:8080/RD/techbulletins.nsf/e667893fe32caf4785256bcd0066752b/942fe371043d8dc085256bc80041605a/$FILE/tb451.pdf

What do you want to do when you walk again (I'd be willing to bet science figures this out within 20 years)?

Two questions: How long have prions been around/when did they evolve? Does the immune system do anything to fight the spread of prions?

That's all true, but proteins do evolve and the immune system may be involved.