I never could decide whether I'd rather have a shot in the tuchus or in the arm. I've had some in my arm that made my arm so sore I could hardly lift it for a day or two! On the other hand, I've had shots in the butt that, as Pippinwhite noted, about made me too sore to sit down.
Injections are a necessary evil, is the best spin I can put on it. I know they are sometimes a necessity, but I can't help but think there's got to be a better way to give some medications than with a needle in the muscle. Seems like we would have come farther along that road in 200 years.