On the advice of our son's pediatrician, Billy and I got tetanus shots last week. The shot itself was a piece of cake, but the day after Billy got his shot, his arm turned black and blue and started hurting. A few days after I got my shot, a big, rock-hard lump developed and it hurt to lay on my left side. We're both recovered (whew!) and it was for a good cause; I now just think it's interesting how differently our bodies reacted.