Yeah, static friction is very strong and kinetic friction is very weak. Several levels I had to wait quite a while for a pig or rock to verrry slowwwly roll off an edge.
Yup, first thing I thought of afterward was friction. But, alas, let me not continue reading too much into one of a few things in the middle of the day that actually keeps me from thinking. Gotta have a refuge at your desk somehow...(besides just getting up and leaving for the day).