Have you ever obtained LSD and it didn't do anything?

This question has to do with the recent past, and far past. Not the future. Please don’t discuss anything related to the present, the future, or scoring.

I just wanna know if anyone’s ever purchased LSD and it did not do anything at all. Perhaps weak, or bunk. Where were you when it happened? Were any of your friends psychologically fooling themselves into thinking it worked? What was the excuse of the friend who obtained it for you… or did you just randomly obtain it at a concert or something?