Carseat destruction!

I got to kill 2 old carseats today. While cleaning out the shed, we found 2 infant seats. Both were expired so I got to try and destroy them. Man, I couldn't do it! I took a hammer to them and it didn't even dent them. I ended up pulling the covers off, cutting the straps, pulling off the foam and writing all over the shells "Expired, Damaged, Do Not Use". Dh will be taking them to work and throwing them in the dumpster (behind a locked gate) so I don't have to stick them on the curb. It was a rather bittersweet experience.