I think mine were my Camponotus Discolor when they escaped. I came home to feed them, checked their nest and it was EMPTY. Well, two dumb stragglers left, looking very confused but EMPTY. I searched EVERYWHERE. Where could they be? There's 300 of them so they have to have lines or scouts somewhere, right? Well, after I located a few they weren't going DOWN the shelf unit but UP. Above them I had a potted plant and I decided to overwater it to see if they came to the surface (mistake. these Camponotus were too stupid to climb out of the water with their brood, I probably lost half of the brood doing this) but had no ant reaction. I kept looking. Later I see several ants going into and out of that same potted plant so I grabbed the plant around the stalks and lifted it from the pot and... was instantly swarmed by ANGRY discolors. Their bites weren't totally painful but they were unexpected so I probably lost a few to being a little um... vigorous in getting them off of me before I realized what was happening. Since then I keep a potted plant near all of my enclosures, just in case thjey escape there will be a VERY close alternative available to them.
Besides that watching my tiny Trachymyrmex haul around steel cut oats that are three times their size is about as cute as it gets.