my sneaky husband

I have this strange talent. Nothing double jointed or anything, but I have this thing with wrapped presents. Even when I was little, I would go around the tree shaking all the presents and telling everyone exactly what they were. And more often than not, I was totally right. I've always thought that I should set up a booth beside Santa in the mall and charge kids $0.25 a present for me to shake it and tell them what it was.
This year for my birthday my mom gave me a really pretty engraved Christmas snow globe. I shook it and jokingly said 'You got me a snow globe?'. Then I opened it to indeed find a snow globe. I don't know how I do it, but I do.
Jeff LOVES to buy presents. I think he gets more excited about the presents he buys people than the presents that he receives. He has the hardest time not telling me what he bought me because he is so excited about it. So, yesterday after work I come home and Jeff tells me he wrapped a present for me and I can go shake it, which is unusual because I'm normally not allowed to touch or shake the presents he gives me. So, I go over to the box, and pick it up and it has got to weigh like 10 pounds! So, I'm shaking it and it's unlike anything I've ever felt and the weight seems so evenly distributed but there is something inside that moves without disrupting weight distribution. I'm totally clueless, I can't figure out what it could possibly be (especially what it could possibly be that I would want). Jeff proceeds to laugh hysterically and do a little victory dance because I can't figure it out. Then he tells me that he ducktaped 3 pipe wrenches to the bottom of the box to throw me off...
I told him that I just inherited 3 pipe wrenches since they were in my present. He said that was fine, but when we needed to use them I was responsible for doing the work. So.... what is a pipe wrench anyway? Does it really have something to do with plumbing?