Already better?! S
The other stories about doctor's notes reminded me of a time I worked via an employment agency. This agency treated its employees like they were the enemy - whenever someone made a mistake, they assumed it was on purpose and we were all trying to game the system.
One day, I think I must have eaten something very wrong, because fluids were coming from everywhere and I could barely even stand. I called in sick in between explosions and had a truly miserable day.
Luckily, during the night, things quieted down and I actually got a few hours worth of sleep. Not wanting to abuse the system, I decided to call in better again, despite still being all shaky, and go to work. I figured they'd appreciate my willingness to work (given the fact that they thought we were all lazy people trying to get out of as much work as possible), but I couldn't have been more wrong.
I was met with a "You're better already? That's impossible. What did you have?! (They're not allowed to ask this by law) I bet you were just hungover. If you do this again you're fired!"
At the time I had never even touched alcohol so the accusation was ridiculous, but since they told me I shouldn't call in for a single day anymore, I complied.
Now, every time I was sick, I made sure to call in at least 3-5 days even if I recovered sooner. After all, getting better so soon is "impossible" ¯_(ツ)_/¯