Source: batman.wikia.com
9. Calendar Man
Come on, how could I not? Calendar Man is the classic ridiculous DC villain archetype.
Born Julian Day, because in the DCU if your name is a noun, you'll be robbing banks before your twelfth birthday, Calendar Man arrived in Gotham with a plan.
To quote his Who's Who entry: Calendar Man "bas[ed] his crimes on the five different seasons- winter, spring, summer, fall, and the Indian monsoon [season]." I'm sorry, what? Is"¦Does India have five seasons? Hold on, checking Wikipedia.
"¦
Ok, so the answer is "mostly no, in very few cases yes, sometimes six." That's a really obscure fact to base one fifth of your crime spree on, Calendar Man.
After getting his butt kicked and sent to prison, Day escaped and faced off with Batman again, this time coming up with a scheme relating to the days of the week. Although I'm assuming his plan revolved around some sort of obscure Sumerian eighth day of the week for no discernable reason.

