I was leading a startup development team in the late 90's and one of our developers told me that some very inappropriate test data had been sent to IBM to be included in a product demo and burned onto tens of thousands of discs that they would distribute.
Eventually it turned out that it was the single word "sheep" - which taken out of the relevant alt.* context was pretty harmless.
Talk about a moment when I thought my career had crashed and burned...
Likewise; they tried to pin it on me, and I had to go to the Git commit history to show it was another employee. My administrative leave was promptly revoked.
I remember a swearword appearing in a very big national company login form once, and I'd have felt sorry for the dev if it wasn't so hilarious.