What's the one file in your codebase everyone's afraid to open?

Every team has one. The file nobody wants to touch.

It's usually not even that long. It's just old enough, tangled enough, and load-bearing enough that everyone's quietly agreed to leave it alone unless it's on fire.

Mine is a 200-line utils file, and somewhere in the middle is this:

function formatData(data) { return formatDataHelper(data); } function formatDataHelper(data) { return formatDataHelperFinal(data); } function formatDataHelperFinal(data) { return data; } 

Three functions. Zero transformation. I don't know who needed this or why, but I'm too scared to delete it in case something, somewhere, depends on the ceremony.

What's yours? Function name and crime optional but encouraged.