National Geographic Channel airs military documentaries every Monday. Calls it Military Monday.
Jason Mraz's blogs about conserving water every published every Wednesday. Calls it Wet Wednesday.
And Twitter has Follow Friday
Now, I have to come up with an idea of copying their idea... Who'd You Rather On Wednesday.
So, we had this same question back in college. Thanks to my gay friend, JC. Recently, I also noticed that TMZ has the same question to their readers on the website. It can be pretty funny most of the time (and disgusting some other times).