Modern supermarkets.
For example: Self-service lanes that don't recognise certain products. You queue up, get going and half way through a yellow box tells you to wait for a member of staff. After waiting several minutes a person emerges who updates the screen at unbelievable speed (with an air suggesting you might've have done yourself) before saying "try it agin now". And finally I can buy my apple.
The other day in Co-op the system actually crashed when I tried to scan bananas. The chap apologised and said "yeah bananas are crashing the system today" so he actually printed off a receipt of my scanned stuff, bagged it, interrupted the normal queue and got the guy to finish it charging for it.
I apologised to the people behind gestured to the self-serve machine and said "it's gone bananas". Everyone just looked angry or p155ed off though.