Sounds like you handled it like a champ! I had a similar situation when I was out to dinner with a friend, had to do a quick change in the bathroom (while he way too politely waited to eat and let his food get cold :().
I started wearing the ostomy belt after that leak and didn't have any more leaks. Just something to consider (or it could be a total fluke)
dx'ed UC pancolitis 5/12
past meds: asacol hd, VSL#3, apriso, rowasa, xifaxan, 6mp, cortifoam, pentasa, cimzia, canasa, butyrate, flagyl, cipro, prednisone, remicade, methotrexate, cholestyramine, cortenema
current meds: none!
step one: colectomy, end ileo 1/16/13
step two: j-pouch construction, loop ileo 5/1/13
step three: takedown 7/31/13