Gosh. If possibly being forgetful once means one is awful, there must be a lot of awful pilots and ATCOs out there. I once forgot to clear someone to land. She might not have forgot to give a landing clearance: I've had more than a handful of pilot-initiated go-arounds because I hadn't cleared an a/c to land. I was going to, but the crew obviously thought they'd rather go around, I know a few of them were on a line-check and had reached DH.