Can't imagine life without Swiss Army knives.
My mainstay is the tiny 58 mm Rambler
knife because it has a combo Phillips screwdriver bottle opener wire-stripper blade.
Here it is cutting the pinhole out of my McCafe coffee lid.
The pinhole is used to vent the lid so it can be lifted off the dispensing stack.
But a pinhole is a pinhole, and I decided to see if it could let me take extreme closeup photos.