Throw a heavy bag ten feet accurately into a gap on a moving conveyor belt.
.. and throw it harder when it's labelled FRAGILE. I sat above the loading bay at LGW once and watched them taking the bags off the conveyor. The normal ones were dropped onto the buggie, those labelled fragile, including photographic equipment belonging to my travelling companion, were hurled with force, and the contents were, of course, damaged. She succeeded in a claim against the airline based on my having filmed this on my 'phone.