If I want to turn my computer off, I have to press the tab labelled "Start".
Have you ever tried drinking from one of those classic triangular martini cocktail glasses? Try moving without the entire contents jumping straight out.
Ladder style heater towel rails? It takes the patience of a Saint to thread a towel onto them.
Modern draught proof letter boxes? They are impenetrable to letters, yet still allow freezing cold draughts to permeate.
The buttons on a Blackberry phone. You need two hands to operate it to get the upper functions, and most human fingers cover an area of 9 buttons anyway.