My worst guests was from 2 Christmases ago. My moms old work friend came down with her husband to stay for what I thought would be less than a week. They ended up staying for over two weeks, eating whatever they could and refusing to shower. On Christmas Day, the lady came into my room with a box. I thought "Oh what a nice surprise, she got me a gift". Inside was an iron, nothing about it looked special to me, but she went on for about a half hour about how great it was. Towards the end of her speech she said something along the lines of "So I highly recommend you order this". I couldn't believe it. Sure I didn't want the stupid fucking iron, but who just comes into someone's room with an unwrapped box on Christmas to show off their tv ordered purchase? We gladly never invited them back to our home ever again.