Today I set out to do a quick practice flight, departing and arriving from KBDL. I loaded 1/3 load of fuel, no PAX, and while I know you aren't generally supposed to, I decided to push back with the reversers since the A/C was so light. I easily got going pretty fast in reverse, backed away from the gate, and taxi'd and took off. However, once I landed and made my way over to the tarmac I wanted to use the reversers again to back up, just for kicks, but this time they wouldn't make the plane budge an inch. Any ideas on why it worked on the heavier load but not at all when it was lighter?

It was raining I was trying to blow dry them!

The Mechanics saw you abusing their engines and to teach you a lesson they disabled the thrust reversers. Good Luck stopping the next time you land. If I was you I would try a bribe (case of booze) to see if you can get on good terms with them again.