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A single line of code from a large application that somehow manages to provide an almost endless insight into the pain that its maintainers face each day.
The addition of nullable or optional types to mainstream languages was a net good. It doesn't completely solve the billion dollar mistake, but it makes it far easier to write safe code.
For most of us anyway.
When discussing ternaries, we also have to discuss readability. While short and concise, they're in some ways too compact. But don't worry, Mark's co-worker has a wonderful simplification to ternaries. This representative line is a pattern used throughout the codebase.
Jul 24pnlErrorMessage.Visible = !string.IsNullOrEmpty(errorMsg) ? true : false;