Before I became such a slave to Photoshop I loved drawing cartoons/comics. As such I LOVE webcomics as an art form, and these are brilliant. Especially #4.
We live in a time where computers can make everything perfect and super-polished. So, these may look like a bunch of unfinished sketches, but these were drawn this way intentionally, and this imperfection adds to the silly and self-decpricating sense of humor being conveyed.
These were found on Tumblr here, but I have been unable to figure out who actually drew them.