I have to send a physical letter. So I go out and find the nearest mailbox from the Swiss Post. As I'm about to put my letter in the box I notice two things. First, as it's already 18:00, I notice that my letter will only be sent tomorrow as it's written that the post guy comes to empty the mailbox at 17:30. 

The Swiss Post people are smart, they manage my expectations well. But the second thing I notice is the one that makes me think these people are really, really smart.

A Swiss post mailbox in Lausanne that says: "The mailbox has already been emptied? Find here other mailboxes that haven't been emptied yet" Below that, you find a QR code that lets you find a mailbox where you can put your mail and have it taken in a few hours instead of the next day.

A notice with a QR code helps me to find other mailboxes where the post guy didn't yet empty the box! This means that if I move a few hundred meters, my letter might arrive tomorrow instead of one day later. That's when my Italian and relaxed origins come out, and I tell myself: why worry for one more day? And I put the letter in the mailbox.

This message didn't help me that time, but if I was stressed about that letter, this could have been a life saviour. Nevertheless this sign teaches me a lesson: offer an alternative when people are blocked in your service.

This is something that the Art Museum "L'Hermitage", again in Lausanne, Switzerland, understands well with their brilliant sign that says: "Parking forbidden here".

At the bottom of the sign, it's written in French: "Parking spots available at the Signal Parking".