My idea worked. Sometimes I surprise myself.
I picked up a length of 1-1/2" PVC and two caps. I cut it to length and put one cap on tight. I slid the fluorescent tube in leaving the single prong exposed and tapped it on a cement block to break the seal, but this was unnecessary and I did a couple without breaking the seal, too. I put the other cap on and flexed the PVC to break the tube inside. I took the loose cap off, held it over a garbage can and tapped the pipe with a hammer to let all the pieces fall into the can.
No fuss, no muss and everything in the can where it belongs.
...and yes, I took a picture of the four shattered tubes in a 5 gal pail /forums/images/graemlins/tongue.gif