Scoposcopy: GIGO, or, Just What Are You Measuring Anyway?
Well, what ARE you measuring? A real signal, or noise?
What is AC coupling used for, what kind of probe are you using, is your system properly grounded?
The oscilloscope is pretty smart but it really _isn’t_ smarter than the user. To get meaningful information from a scope, it helps to know what _meaningless_ information looks like and how to obtain it.