Hardest part of being s mechanic

I was outside a store waiting for my wife, listening to a Ram 1500 with a 5.7 idle... I had to try soooo hard not to knock on the window and let the girl driving know her lifter is junk and she is about to lose a camshaft lobe, and if she doesn't fix it ASAP she will need bottom end bearings and a new oil pump.

It's tough out here trying not to bother people.