in personal opinion. why do the Royal family uses the money from the taxpayers? should remove royalties. they should work for their own keep. and stop using the money from the citizens.
I think it is basic courtesy that when the place is packed and you not able to get a table. and u r okay with sharing a table with strangers, wait for the person to be back on the table and ask permission. the wrong way is that you didn't wait and simply sit down and eat without waiting for the person who actually reserved the table first.
to cyclists, do vehicle drivers honk their honk to tell people to give way? no. they use light signals. cyclists use light signals to alert others there are cyclists cycling on the road when they are cycling in daytime and in night time.