Swiss army knives

Swiss army knives have small gashes on each tool to make it easy to open the tool from the body of the knife. A left-handed knife has the gashes on the other side of the blade so that you can hold the body of the knife in the left hand ready for use and open the tool with the right thumb.

And of course the scissors and corkscrew are made for left-handers (scissors blades reversed and corkscrew to be turned anti- clockwise).