So, We plowed in a line that had been laying out (40' or so) since friday. After we dug up were the heads were, I went to cut the pipe and put the first tee in and I cut right through a slug that was inside the pipe. This was a big slug, around 4" long. It came out in two squirming 2" halves. I think the odds of that one spot I chose to cut having a slug in it are pretty rare, funny stuff. At least I got it out now, instead of having to fish it out of a clogged valve later.