Take a drink every time Waters' vocals echo or he shouts in the background to his own singing.
Take a drink every time you hear sound effects that don't make very much sense.
Take two drinks if it's not the first time you hear it.
Take a drink for every live performance of The Wall. Not every tour, every live performance. Drink twice if said performance is a Roger Waters one and not a Pink Floyd one. Finish your drink if it's The Wall - Live in Berlin.
Down your drink whenever you hear about Margaret Thatcher. If there is a chance any songs from The Final Cut will be played, please have an ambulance at the ready.