Word 2.0 forever made me distrust Microsoft with an error: "File too large to save."

It was on a 20Mb hard drive, and the file was small enough to fit on a 1.44Mb floppy.

Turns out it was an obscure defect in Word: if you had quick save on, and the last page had a diagram or image, it would choke. Quick save or fast save - I forget what it was called. This would append deltas to your file, I think.