There are few things more irritating than everyday objects that are badly designed. In our building at work, we have stainless steel sinks in the toilets, which are circular in outline, and more or less hemispherical in shape. They look lovely but are hugely irritating to use. You know what happens when you turn on the tap in your kitchen sink without realising that there's a upturned teaspoon in the bottom of the sink? Well, imagine that effect but with a teaspoon the size of the entire sink. Water striking the sink with moderate force bounces straight off and conveniently soaks your groin area, rather than dampening your hands, which would have been much more useful.
I hate those sinks.