What an idiot

I got a bad grade at some chemistry lab recently, and to this day, "Al" (name changed to protect the guilty), blames our bad grade on my (supposed) incompetence. I remembered just now (nearly a week later) that it was Al who didn't even read the lab or know what we were supposed to do. If I ever to work a lab with Al again, I'll remind him of his own incompetence, and he shouldn't try to attempt to sponge off of me ever again.