Here's a low-stakes hand of online poker I played a while back that featured a not uncommon sequence of events, at least among recreational players or "non-regs."
After raising with from late position and getting one caller from the big blind, my opponent quickly check-called my continuation bet after a flop. We'd been at the same table for a while, during which time he'd revealed himself to be one of those "sticky" loose-passive types frequently found at these small limits.
The came on the turn, and this time after the big blind checked I chose to check as well.