^Ever read about a 'thumbprint of lsd'? (this is not what I was going for, the dose I actually ingested was also not what I was going for btw).
But I haven't heard about an actual lethal dose of lsd. There was this myth going around for while where a dude shot 240mg of lsd thinking it was speed but I've never seen credible sources to confirm that story. Also thumbprint with lsd does happen. I wouldnt ever recommend nor would I want to try it. But some people do try it. If someone does really want to try it, generally they tend to do it in extremely safe environments with people they literally trust with their lives.