Surrounded by Animals

On a high school trip, my friends went into an animal farm first. They wanted to take pictures with the animals and asked the teacher to take them. I could still take pictures before I went in, but as soon as I entered, the animals ignored me. I wished they'd come over to me, but when it was time to get on the tour bus, suddenly I was pinned down by the animals, and my bag was stuck. I couldn't pull it out no matter how hard I tried. The teacher asked why I wasn't getting on the bus yet. I said I couldn't move. The teacher thought I was joking and went to ask the farm owner to take a look. But even the farm owner couldn't pull it out. One lead sheep was pulled out, and then the whole flock started pressing down on my bag. The lead sheep let out a sudden cry, and another sheep jumped up and pinned my bag down again. Guess what? How did we finally get it unstuck?