As I always suspected, just by looking at their little plastic shapes, T-rexes couldn't possible run without falling. After watching a DVD with the kids today, I found out that apparently most are found with fractured pelvises. One hypothesis is that they were slow scavengers with an extraordinary sense of olfaction. Just look at their nostrils.
My hunch was confirmed about 10 years ago by John Hutchinson of Stanford.
Nor sure if you find it as fascinating as I do, but you can find more here.