1. Not seeing Rocky Horror in Sendai in 2003
    Lesson: Logistical challenges are part of the adventure
  2. Not seeing Laurie Anderson in Tokyo in 1987
    Lesson: Better to go alone than not go
  3. Not seizing Simon and Garfunkel in Central Park in 1991
    Lesson: Your girlfriend might be right
  4. Not seeing Roxy Music in Lisbon 1982
    Lesson: Too painful to discuss
  5. On the toilet
    Suggested by @madeline