Worst Concerts You Have Attended ??

I just left a remark about a favorite band of mine back in the day - April Wine - that I saw in concert and was disappointed. Could have been that it was an off night for them, or maybe they were never good in concert. Maybe the lead guitarist had too much to drink? April Wine was not the worst, however. I remember Neil Young in the 1990's who was on his one-man acoustic show type of tour that many artists were taking advantage of (perhaps for financial reasons) during that time. While a friend of I had near front row seats at Desert Sky Pavilion (now Ak-Chin) in Pheonix, the crowd was just roused up into a frenzy by the warm-up band (James) and here comes Neil and his guitar/harmonica. Wow, what a sonic letdown. I remember getting up and leaving and feeling Neil's glaring eyes on us as we ushered out. I think, to this day, he probably still remembers me. We all can remember the great live concerts we attended, but what were the worst and why?
Big Joe Bonamassa fan. Wife and I have seen him 5 times but the last one 4 or so years back at the Fox Theater in Detroit was just too darn loud and that ruined it for me. So loud you could not hear the music. Add the cost of front row seats and I’d have to say it all added up to be the worse I’ve attended.

I know you didn’t ask but the best took place on August 15-18, 1969. Sound was less then to be desired but the fun factor..OH the fun factor.
Motion City Soundtrack in Bloomington IL. Can’t remember the name of the venue. Whoever was running the soundboard that night was either a rookie, tone deaf or absent. 
Dolly Parton at Carnegie Hall, around 1992 or so. Private concert for Sony Music. OMG, cornball music and a voice that was like an ice-pick in the ear..
U2... the were the first event in Jerryworld (Dallas AT&T stadium). The sound was better outside the arena than inside. I know because I left in middle of the concert. 
I don’t blame U2. The arena wasn’t designed for acoustics and the echoes were horrendous 
I can imagine U2 being the worst even if the acoustics were good. Bono is such a bore.