[hulitu]

... until all your numbers become dates.

[dugmartin]

Or all your zip codes with leading zeros get silently truncated.

[disgruntledphd2]

Or until all your 16 digit IDs get truncated...

[aloisdg]

... or until all your molecules become dates.

[2Gkashmiri]

Why do I remember awk with that story?

[OGWhales]

Or your numbers are wrong because you didn't wrap in parentheses.

Example, put these two formulas in excel:

=(4/3 - 1)*3 - 1

=((4/3 - 1)*3 - 1)

[dns_snek]

The online version, at least, seems to be wrong when you do wrap it in parentheses:

=(4/3 - 1)*3 - 1 = 0

=((4/3 - 1)*3 - 1) = -2.22045E-16

[OGWhales]

Check out page 3-5 of this paper called How Futile are Mindless Assessments of Roundoff in Floating-Point Computation? [0]. It explains what is happening here better than I can and is where I got this example from.

[0]: https://people.eecs.berkeley.edu/~wkahan/Mindless.pdf

[SantalBlush]

Or until your empty cells aren't truly empty, so you can't count the nonempty cells.

[hef19898]

That reminds of a jokester who replaced all empty cells in small spread sheet with a space. Good lick figuring out why your 5 row table all of a sudden was in the giga bytes of size (obvious exageration for dramatic reasons). Was a good practical joke so!