I've heard of a snake in the grass, but this is ridiculous.
So I'm doing my afternoon walk, which takes me past a large, undeveloped field near the house (kind of a rare sight, getting even rarer, so I'm enjoying it while I can) and I see something stuck in the chain-link fence.
Only it's not stuck. It's cruising along rapidly.
Closer inspection reveals that it's a snake, who has traded ground-level motoring for a more monorail approach to scoping his environs. Chalk that one up to "never seen before."