Saw Live at The Icon in Buffalo just days after Throwing Copper came out (meaning before they started playing big arenas) - at the end of what was an AMAZING show the drummer threw his sticks into the crowd, one of which hit me square on the bridge of my nose. Pretty nasty cut, and someone else grabbed the stick.
2nd concert ever (at 14 years old) - KISS opened their Love Gun tour in 1977 at the Forum in Halifax Nova Scotia. Cheap Trick opened. Took almost an hour between bands, but when the lights finally did go down it was just a complete sensory overload with the crowd going crazy, the flames, stage show, and of course they were really loud.
Rush Vapor Trails tour at the War Memorial here in Rochester, the day after my 40th birthday, 2nd row seats in front of Geddy Lee. Felt the music more than heard it.
Van Halen Women & Children First tour in Dallas TX - I remember someone threw a joint up on stage. David Lee Roth stopped the show, held it up and when every spotlight in the place was on it he asked "What the !@#$ is this?!?!?!" He lit it up there on stage. Forgot lyrics for the rest of the night
Sorry, that was 4 concert moments.