Did you ever notice how as time passes more and more of your cups, plates and glasses from your kitchen cupboard become the last surviving utensil from a set - a one of a kind?
There is simple mathematical explanation.
Let's say we have 1 brown cup and a set of 4 blue cups.
If no family member prefers either cup color, grabbing the first one he finds, when he decides to have a warm, tasty cup of tea, it means a blue cup will be used 4x more often than the brown one.
Because cups only very rarely break on their own volition this means a blue cup is also 4x more likely to break.
Unsurprisingly, this leads to colorful cupboard contents.