Si, although I don't know the offical answer, I'm going to have to weigh in on the side of bracket follwed by full stop. It just looks better.
Now, here's a question...
It arose when 'The Mummy' was being watched last night. After the bandaged one is duly defeated, and hero, good-looking English girl and comedy John Hannah are making off triumphant on camels, (as you do) the camera focuses on the treasure that has been stowed in the saddlebags by the snivelling henchman (who has recently recieved his comeuppance, as they do), and it glints in the sun and goes ding! (as it does).
Now the question is this. WHY is it that going ding! is as is does? (the preceding sentence may or may not make sense. I suspect the former.) Why do all shiny things in movies /ads go ding!? It this the sound of being shiny? Has anyone actually heard something shiny go ding! when the sun hit it? Has anyone had someone flash them a smile which was accompanied by an audible ding! noise?
Perhaps this is similar to the tree in the forest which falls when no-one is around to hear it. Our heroes were not paying attention to their treasure (it's implied they don't even know it's there yet) and so maybe only the audience could hear the noise. Maybe in real life on sunny days your car windscreen / watch crystal / silver cutlery / used car salesman's cheesy grin is going ding! ding! ding! ding! the moment you turn your back.
I think at the next available opportunity I must secrete a microphone and a tape recorder about my person, activate them, and quickly spin around and take the stainless steel parts of my bicycle by surprise.
The truth must be known.