When I was a child, my sister played a horrible practical joke on me. She was babysitting me, and as usual, I was being a little devil. After a while, I demanded she made me macaroni and cheese. I also demanded she brought me a glass of milk. Being the person she is, she complied. The macaroni and cheese was great, but when I took a swig of milk, I immediately threw up. She was angry that I was being mean to her, so she poured me a glass of buttermilk. She felt awful and I was even more pissed. But looking back on this, I realize how funny it actually was. I am asking you guys to post the best/worst practical jokes you have ever played on someone or have ever had played to you.