I was at Karlsruhe Zoo during Easter weekend with my family.
What amazed my 3 year old son the most was not the monkeys at the zoo, but the bus undergoing repair in front of the zoo.
It blew me away too, to see a pick-up truck and a van at the spot, engaged in replacing a tyre and 20+ onlookers (all watching just the tyre being replaced with at most curiosity).
Seems like German tyres are really tough! They rarely let the rim touch the ground.
Deutsche Bahn 