I remember being in the audience at Earls Court in either '77 or '78 to see Genesis (the Seconds Out line-up). Collins began telling a story and was almost at the punchline when some spoilsport in the crowd yelled out "Supper's Ready", thus taking the dramatic tension out of the story for all of us (unless it was just me) who hadn't seen them live before. To his credit, Collins finished the story, we all went wild, and they absolutely nailed it. One of the best concerts that I have ever had the pleasure of attending.
I can never remember if it was the week before, or the week after that I saw Bowie at the same venue, for the Heroes tour. Adrian Belew's playing, especially on the intro to Station to Station, was breathtaking. Oh yeah, Bowie could sing a bit too.