A very good reason to patch tubes. The patches serve as documentation to location on the tire. Patches showing up around the same place (or same distance from the valve) tell you there is an issue in the tire or rim. (For this reason, always put tires on the same way. Convention is label to the drive side of bike and centered at the valve. Now you can just put the tube in the half mounted tire and search where the patched are for glass, thorns, the tiny short pieces of hair-like wire from var tires and issues on the rim and tape.)
Edit: I weigh 155 and pump 25s to 100. Pinch flats very often come in pairs, hence called "snakebites" as both sides are pinched by their respective rim. If you patch, you quickly find two holes, not one and you now know the cause.
Last edited by 79pmooney; 06-29-20 at 07:44 PM.