All dumps are functional its just that only some are more functional than others. A truely functional dump is one of which there is no real experience because it is purley functional e.g. you are extremely busy and the your sphincter starts sending messages that a dump is imminent however you don't have the time to enjoy it so it is simply a quick sit and shit. There is no time to experience the ambience of the W.C. i.e the sights, sounds and smells. There is no time to enjoy the relief that comes from dropping the kids off
Sorry I can't stop to talk. I've just had to take functional dump 'cos I've got a shit load of stuff to do.