My best moment would be out of....
Going to the universal appeal concert, thinking that there was no way that one wild night would get played....but at the time it was my absolute favourite song....
then they actually opened the concert with it!!

or

When my friends and I were at a club and a band took 1 request song, everyone was just yelling everything out, and I was yelling out Livin' on a prayer, and the band member said "I've made up my mind....we are playing livin' on a prayer" It was so awesome