I was pleased to see this new bike parking this morning on Liverpool Grove, just off south London's famous Walworth Road. Charlie Chaplin hailed from round here, so it's appropriate that I don't get the joke here either.
The three racks, evidently installed by someone under the impression they were for very large slices of toast, provide between them enough parking for two whole bikes: one each on the outsides of the system.
In fact, make that four bikes, if you could somehow contrive to squeeze a couple of them into the spaces in between. The task would present few problems to those practised in making knockabout silent comedies.