If you spend any time in third world conflict zones, you will likely see people carrying (and maybe using) the RPG-7.
I actually got the chance to shoot one of these in Cambodia. Read my article titled Adventures with RPGs and Hand Grenades for more details of that unique experience.
If you are traveling in areas where these things are prevalent, you should probably know how they work. Ian from Forgotten Weapons provides you with the basic information in the video below.
RPG-7: How it Works and a Demo Shot