A poison that I knew would be a hundred percent effective, undetectable and fast with no side effects would be the most entertaining way to go. Not sure if it exists but I could have morbid fun with the ability to die quickly.
Maybe I'd take the drug discretely just before I step up to the counter at a fast food place. The staff ask "May I take your order" and I just drop dead.
Maybe I'd try to drop dead while crossing a busy intersection and hold up traffic while they scrape by dead ass off the crosswalk.
Or I die in a hospital waiting room after telling the other people waiting that I'm just there for a follow up after minor surgery and how wonderful the doctors are.
Or I go to a televised healer show, get in line to go on stage, and, without anyone noticing, take the med before he/she touches me. The thought of someone dropping dead on national television when some b.s. healer touches them would be hysterical.