We encountered a huge red eared slider in the road. This old lady (I'm guessing) was at least a foot long in the carapace and covered with algae. I picked her up, dodged the obligatory defensive pee, and deposited her on the muddy pond bank about a foot away from the water.
The turtle just sat there hunkered down in her shell. I gave her a good "GIT!" like you'd use with a stubborn horse and she hauled ass off into the water.