Hm, maybe you dropped them in the ocean and they dissolved?
assistant
Alright, that's not very helpful.  Let's try to remember the last time we used some.  We last used LSD two days ago, during class. We took three doses and talked about philosophy.  We also found a loophole in the world's law code, and plugged it.
assistant
Where can I find some LSD?
user
Okay, let’s figure this out.  What did you do with your last two doses of LSD?
assistant
I don't know I guess I lost them?
user