instantly lethal to anyone who steps on it

I like to pretend the afterlife is like a big AA meeting or group therapy session where people have conversations about how they died.

"So how did you die?"

"Oh, I broke into someone's house. The bastard left Legos everywhere. I tried my best to avoid them all, but it was so dark that I missed a dark blue 1x1 brick. It shattered every bone in my leg like tempered glass. The sudden collapse from pain and losing all structural integrity in my leg caused me to fall on the remaining Legos. A green plate sliced my jugular. The last thing I remember as things were going dark was a dark figure approaching. It was holding a Lego Millennium Falcon above its head as if it was going to throw it full-force against my skull. The next thing I knew, I was here."