One of the funniest footway cyclist 'conversations' I've seen occurred when I was walking along with a mate of mine. He's a big bloke, and notoriously blunt.
We were walking along a relatively narrow footway in a town one afternoon, when a cocky looking bloke thought he'd charge toward us, expecting us to breath in or step on to a busy road to allow him past. My mate stepped slightly to one side, but stuck his arm out and grabbed the lad by the shirt, lifting him bodily off his bike, which clattered against the wall. My mate simply barked at him "this is a footpath" put him down and we both wandered off, with the lad deciding it was probably wise to say nothing, but just collect his bike and walk off sheepishly in the opposite direction.