I always think of this bit from Tommy Boy, when looking at warranties.
Tommy: Let's think about this for a sec, Ted. Why would somebody put a guarantee on a box? Hmmm, very interesting.
Ted Nelson, Customer: Go on, I'm listening.
Tommy: Here's the way I see it, Ted. Guy puts a fancy guarantee on a box 'cause he wants you to feel all warm and toasty inside.
Ted Nelson, Customer: Yeah, makes a man feel good.
Tommy: 'Course it does. Why shouldn't it? Ya figure you put that little box under your pillow at night, the Guarantee Fairy might come by and leave a quarter, am I right, Ted?
[chuckles until he sees that Ted is not laughing]
Ted Nelson, Customer: [impatiently] What's your point?
Tommy: The point is, how do you know the fairy isn't a crazy glue sniffer? "Building model airplanes" says the little fairy; well, we're not buying it. He sneaks into your house once, that's all it takes. The next thing you know, there's money missing off the dresser, and your daughter's knocked up. I seen it a hundred times.
Ted Nelson, Customer: But why do they put a guarantee on the box?
Tommy: Because they know all they sold ya was a guaranteed piece of ****. That's all it is, isn't it? Hey, if you want me to take a dump in a box and mark it guaranteed, I will. I got spare time. But for now, for your customer's sake, for your daughter's sake, ya might wanna think about buying a quality product from me.