My very first time ingesting a psychedelic chemical was with an NBOMe compound sold to me as LSD. At the time I was very psychedelic-naive, and really did think that my material was genuine LSD. After further research, I have determined that the compound was indeed 25x-NBOMe for two reasons:
1. The unprinted side of the blotter was pink - LSD is colorless
2. The chemical had a very bitter and metallic taste and quickly numbed my gums - LSD is tasteless
Not knowing these things, I took two tabs hoping for a great experience. Thankfully the SSRI I was taking at the time completely kept me from experiencing any effect whatsoever (SSRI's tend to dampen the effects of phenethylamines more than tryptamines or ergolines, from what I've read and experienced). Had this not been the case, I would have undoubtedly been in for a terrible, if not deadly, experience.