I didn't know he/she could move that fast!

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I was thinking today (for no real reason) about people who were generally considered lazy but could really move FAST when they wanted to. I've known several people who fit this description in my life, and I wonder how many of you know people like this as well. My first example is my great-grandmother. She was very old, very fat, and tended to spend most of her time sitting in her recliner, at least when I was around. Yet I saw her jump out of her chair, grab a broom, and literally sweep my grandmother out of her home one day when my grandmother was being very offensive! Not only that, but when I was doing something dangerous, my great-grandmother would suddenly just be right there behind me to catch me, no matter how far away she had been a few seconds before! My other example is a friend of mine. He is one of those people that gives you the impression he could go days without moving. Once when we lived in the same apartment and he was unemployed, I saw him pretty much sit on the couch for 6 months straight. He tends to slouch, and leans on everything even when he's standing. Yet one day at a roleplaying game a fellow gamer got on his nerves one too many times, and my friends jumped over the table and attacked the guy. In all of these cases, strong emotions seemed to be involved, whether angry or protective. Perhaps all that being lazy is really storing up energy that gets burned off in quick bursts of hyperactivity? Anyone have any similar stories about people who suddenly proved that even their lazy butts could move fast when the situation called for it?