Once when I overdosed on diphenhydramine (not intentionally.. shitty week, wanted to sleep the whole next day), I woke up early the next day because I had also been drinking. When I did, I started freaking out every 5 seconds 'cuz I was 100% positive my house was infested with bugs. I think I first thought I saw a bunch of flies in my room then when I started looking around I saw really tiny bugs all over the place and I checked multiple rooms and woke my mother up screaming, "UMMM, we need to call in an exterminator right now." It wasn't until they came to inspect the so-called bugs with me that I started to doubt myself. I was so positive because I thought I was sober, but apparently every little piece of dirt/stain I thought was a bug and moving. Luckily no one ever realized why I was hallucinating. And I think was only the second or third time I ever hallucinated. And definitely the scariest hallucination. Now I'm way too scared to ever do psychedelics again in case I ever start freaking out about bugs.