Cycling back along the Thames tow path. There is a cyclist dismount sign over a stretch of 20 yards or so at Sunbury lock, so I just slow down, there is nobody around, so I carry on, get back on the tow path and some fat so and so who was just leaning on the rail looking at the boats shouts at me if I haven't seen the no cycling sign. Felt like getting of the bike and asking what the problem was, I just punished him with my indifference. I mean, really?