It is one of the funniest (but at times also most annoying) phenomenon of London buses. You keep waiting AGES for a bus... and then two or three often even with the same destination come along at once. They called this phenomenon bunching as far as I remember.
We are talking about buses, right.
However, here in Brazil parcels seem to fit into the same bunching category it seems. You feel like no letters or parcels from home are arriving when people finally ask whether you got their (SUPPOSED TO BE) SURPRISE parcel, both of you already believe some of them got lost(or stolen-used (my favourite soft toothbrush that my mum had sent by parcel) or eaten (Lindt chocolate), depending on the delicious content :D lol) which did happen at times.
|Berlin Girl's surprise parcel|
Parcel bunching it is.