These guys have taken the idea of express parcel delivery to new heights

Safety blunder - window

Safety blunder - mid flight

Safety blunder - ground level

Thanks to Ben Gardiner for these photos, which he took in Manchester city centre.

He says: "Whilst you see lots of people taking risks at heights without proper safety equipment, these workers are putting the people below in danger by being too lazy to use the stairs. I'm not sure what was in those cardboard boxes but they were making a loud sound when they hit the car park."