I've seen a couple of cars with multiple tickets - one with about 10, and one in a motorway services with probably about 30 tickets - I think that one had a note on the dashboard saying "Broken down" or something. The windscreen was completely covered with tickets anyway.
One thing that used to work for someone at our venue was to drive onto the kerb, switch on his hazard lights and leave his boot wide open all evening. Because nobody would do that if they weren't making a real delivery.
I've been pulled for speeding once, in France, but the points never made it over the channel.