Wheels: airport trolleys and children's push chairs

Have you ever experienced that the trolley you managed to pull out of the park is often faulty? It's Murphy's law. I leanred about this Murphy's law in university. It is an adage in Western culture that broadly states, "if anything can go wrong, it will." or as my university lecturer said, "the queue you choose will turn out to be the slowest."

Here is Sam with his cousins Jessie and Christopher on wheels at the Changi Airport in Singapore.