I third Shawn - I regularly do butts or briskets to bring to work, and time them such that they come off the smoker between 6 and 7 am, wrap 'em up tight in foil and polar fleece, tuck them in the rolling cooler along with a couple of foil pans, towels, knives, gloves, and foil. They're still very hot come lunch time. A conference room table or empty desk is my "kitchen", and a nicely cooked and rested butt will quickly fall apart in abject fear if you just point a knife at it. Slide a bone out for your co-workers for the dramatic effect of it, and then just chunk up the meat a little bit, telling them that it's a miniature "pig pickin'", and that they have to do their own pulling as Russ suggested.
If you do go with the crockpot, I would add a little liquid. Courtesy of Dale G and tweaked a bit by me, try blending 1/3 cup each apple juice, chicken broth, and bbq sauce, (or 2/3 cup apple juice and 1/3 cup bbq sauce), adding a tablespoon of your rub and maybe a tablespoon or two of cider vinegar. It's okay if it tastes pretty salty - pork likes salt. Add about 1/2 to 1 cup of this concoction per each cooked butt as you're chunking it up. Be SURE to put this liquid in a Mason jar with a hand-written label on the top clearly reading BUTT JUICE. Adds to the mystique, doncha know...
Keri C, smokin' on Tulsa Time (dba HOT WIRE BBQ)