Toggle Interaction
Levers don't just switch redstone, they also let you toggle interaction modifiers on slimestaffs and fishing rods between activating on interacting with the staff to activating on attacking with the staff.
Never heard of a slimestaff? You will have to read the book by that nerd Melvin.
Click on the arrows, icons, and links to navigate the book.
Having trouble interacting? View the book using the gallery.