Do not hog the entire overhead bin with your jacket or other small item.
Do not complain if the flight attendant moves your belongings if ignoring the above suggestion.
Do not touch the belongings of other passengers when attempting to fit your items in the overhead bin.
Eat before you board instead of placing perishable food — especially odoriferous items — in the overhead bin.
Check your baggage if it will not fit in the overhead bin — do not attempt to shove and push while holding up the boarding process.
Even though it has nothing to do with overhead bins, do not place your feet— especially odoriferous ones — on the bulkhead wall in front of you, or anywhere else other than under the seat in front of you, if applicable.
Furthermore, do not change the diaper of your baby between the first class cabin and the galley.
As you can see, the direction of the discussion veers further off-topic but becomes no less interesting…