Isaiah Mustafa, the man who stars in all those hilarious Old Spice commercials, joined the scores of celebrities getting in on the Ice Bucket Challenge , but we have to say: we didn't see this one coming. We should have known that the Old Spice guy wouldn't be able to perform the challenge like the rest of us normal humans, and he shares the heartbreaking reason why it just can't happen. Of course, there are plenty of celebrities who haven't done the challenge  yet, so we have to give the guy credit for trying. We've got the video above and our favorite quotes below. Enjoy, humans.