Apple always gets the pocket knife.
Have a front tooth that got busted out as a kid, and it's replaced with an appliance nowadays. Eating apples by the slice keeps me from prying into it with the dental work.
Nothing goes with the apple slice quite like a piece of Tillamook Sharp White Cheddar. Takes a knife to slice off a chunk.
Peeling an orange and grapefruit also gets the knife. I circumnavigate the peel with one slice, then turn it 180 and do it again. This leaves 4 sections or "quarter peels" that come right off.
Lastly, we have a local meat guy who makes the finest summer sausage I ever had. Slicing little wheels of it off is a snap with any of the pocket knives I use. Slice off another piece of cheese from the Tillamook baby loaf and your Ritz crackers have never been happier.