When you stare at your syntactically correct but logically wrong code for hours but can't find that little bitch of an error.
And then you call up your colleague, and it doesn't take him 4.3seconds to spot it.
-___________________-

Classic procedure:
A: "Hey can you help me I've got a bug I can't find for hours"
B: "sure"
*starts teamviewer*
A: "so here is the code which should do xyz and I implemented it like...wait..."
*instantly sees bug*
*facepalm*
A: "thanks"
B: "np"

rubber duckity duck debugging helps 😉

Yes I have done this with circular dependencies

@scroach human rubber duck?

@jacoKotze seem familiar?