What goes on in my head?

Another inscrutable comment in my notes, this time in the margin of my Crim book. As a side comment on declaratory judgments, I've written:

declaratory judgment
- get rights declared w/o enforcement
- mushroom v. toadstool

It's that second bullet that has me worried, as I have no idea what might have prompted it. Maybe I need to lay off the mushrooms for a while...