There might be situations you face where you need to open a beer and dont have anything to open it with. This is unlikely in a bar, but when you attend a party or an event, it is ridiculously common. Obviously someone steals all the bottle openers. Anyway, this is not in the RSA course, but is still very handy, the videos below describe two different ways to open a beer with around the house materials.
If you prefer to work in an environment that is organized and has its OWN bottle opener, then get your RSA certificate so that you can work in a bar, and open beers properly!