It's bad to throw things.
John is on his balcony on the 4th floor when his friend James comes over and asks John to let him in the building.
John wants to get James into the building.
John tells Bill to hang on and runs downstairs and opens the door from the inside so Bill can get in.
"John grabs the building lobby keys out of his pocket and throws them at James below yelling ""catch!""."
Bill is happy to see his friend let him in, so they can hang out and have a fun time together.
James thinks John is lazy and questions his friend's judgement in throwing a sharp object at him from such a distance.