Whats the weirdest concert you ever attended?

I have to say this is only bought up by one particular concert I attended in 1970 in Birmingham England.
I went to see a German band called Faust. They had a bit of a reputation for being more weird than most, and that's saying something given other bands around at the time and had an underground following along with Henry Pig and Hatfield and the North.
So.... I was in row two and eagerly waiting for the show to start. The auditorium was completely dark except for the lights on the amps. At each side of the stage there was a big old 36" colour TV set and a pinball machine.

In due course, everyone assumed that the band came on stage as the light on the amps went off in sequence as if someone was walking past them. Then, eventually, odd sounds started emanating from where we assumed the band was. Still no lights. Then the TV's burst into life and were showing a different channel on either side of the stage. Still no sign of the band.
Next a guy walks on stage in just his underpants (1970's Y fronts)and starts playing the pinball machine. Every time he used the flipper the TV channel changed.

This was how the whole one and a half hours were spent until the guy on the pinball either got bored or the band got bored but he just walked off, the music stopped and the lights on the amps flickered again so we assumed that the band had left the stage.

During the course of the "concert", there was all sorts of aromas of illicit substances. To put the icing on the cake, about half way through, a woman in the front row turned round to me and said "would you hold this for me" offering a newly lighted special cigarette. After passing it to me she proceeded to turn back to the front, lean on the stage, have very quick very rough sex doggy fashion with someone I can only assume was her partner and then ask me for her joint back!

My head was really messed up for weeks and I'm still not sure if it was the concert or the side show which was to blame.

ZZ Top at Madison Square Garden. I had floor seats and the bathrooms were a mess. People throwing up in the corners, and pissing in the sinks. There was more alcohol there than in a distillery.

Another vote for The Tubes; 1974, Roxy Theatre in Northampton, PA. My all time favorite venue (the Mesa Amphitheater, Mesa, AZ second). Still operating today.

In 1987 a tornado wiped out Saragosa, a small town in Texas. A benefit concert was held at Manor Downs near Austin. Los Lobos (recently charting with "La Bamba"), Neil Young and Johnny Cash were scheduled.

The show was well advertised, but only 700 people showed up. My theory is that the three fan groups avoided each other.

Mid 1980s in little Springfield, IL. Aerosmith was the headliner. I was psyched to have seats about the 10th row. Steven Tyler was SO F**ked up, he couldn't sing the first song intelligibly. If you have seen an Aerosmith concert, Steven uses the microphone stand as a visual prop. He kept dropping the mic stand. Steven left the stage, Joe Perry stepped up and sang song #2, and well. Steven came out for song #3, obviously had been showered, hair still wet. Steven starts to sing Back in the Saddle. About 1/3 of the way through the song, Steven sings to the front row, leaning forward.....

And falls into the orchestra pit. Lights come on. Show over. 2.5 songs into the concert.

To make up for it, no money was refunded but we all got a copy of Aerosmiths Greatest Hits. Now, who at the concert didn't already have that album would be beyond me. Of course, Tyler cleaned up his act and I actually went on to see them a few more times. Talented guys.