"u mad" is used to often enrage people further by, obviously, asking if they're mad.
Most people would've knew that I was kidding, but whatever.
You didn't even seem to have even an inside joke, just an attempt at making people guess your joke out.
Hey starfish, the joke was that I said that I took a picture of my snake, but instead of showing a picture of my snake it was a black box.
If you didn't get it, then you really must be batstuff stupid.
Now shut up.
You're the one who started this argument over a loving black square.
inb4youcontinuethisargument.