Hmm. I could see nefarious purposes for that... Imagine putting one on the bumper of your car.
Walking into a store with CRTs could also be interesting, you would be your own localized electronics fryer.
There's also the option of letting fly with the magnet against a car with the neighbor's annoying yapper dog: *yip yip yip* *BANG splat* (I am *NOT* condoning random violence against annoying little dogs.)
You could also go highway boarding, throw it at a semi, go for a ride. Though that semi may start picking up cars on the way...