Coworker: Oh, I couldn't find my Excel file, can you help me to find it?
Me: What is your file name?
Coworker: The file created long time ago, I forgot my file name. But I open it yesterday.
Me: Ok, let's check open recent. (It's surprisingly empty)
Coworker: Yeah, I cleared it just before you arrived. I thought clearing the recent item, will show older items.
Me: ...Ok, let's do a search on all Excel items, which drive did you save your file?
Coworker: I don't remember.
Me: (After search) There are 1000 Excel files. You can start from eliminating the items you remember and ultimately you will find your file. That's all I can help.
Coworker: @x$(/"! ?!

There always a forgetful coworker around me that thinks I am a magician.