If I were my student, I would show myself no mercy, and insist that I find the source or take an F for cheating. I just...couldn't....post without proper credit. And I like these pictures too much to not post them!
I tell you all that to tell you this: I looked for over an hour two separate times, and finally found my sources (see also the original inspiration here and here). I tell you this because I could've just posted and said "I saw this idea someplace." But for once I did the right thing. And I'm proud of myself.
So there you go. What did you do this weekend?