So earlier today I went to take the required covid test before my flight to NYC tomorrow. I took the rapid test (antigen) and after the test they told me I could wait 15 minutes for the result and they'd give me the printout also to show at the airport. So 20 minutes later, the tester comes to me and says:
Are you vaccinated?
Me: Yes!
Do you have symptoms?
Me: No!
Well, unfortunately your test is positive...
At this point I almost have a heart attack, because this means I can't fly tomorrow.
Me (mind racing): But that's impossible! (I've been very careful the last week and had no close contact with anyone, other than brief shopping.)
She continues: The positive line was faint but visible, so you are maybe at the beginning or end of the infection.
Me: But that's impossible! (This conversation was all in French btw... "Mais ce n'est pas possible!") I explain that I've been at home the last week with no contacts other than brief shopping.
She insists it's definitely possible because of how contagious it is now, and offers to redo the test to verify. At this point I'm panicking and my mind is racing: is it possible that the Paris salsa weekend I went to 2+ weeks ago somehow gave me an asymptomatic infection that persisted until now so strongly that the antigen test was positive... (antigen tests only catch "true", contagious infections, so usually only around the first few days of symptoms.)
After a second traumatic test in which she really took her time to "make sure the result is clear", she goes to check my form and...that's not my name on the form.

Turns out she had already run my test, had already entered the NEGATIVE result in the system correctly, but for some reason as I was the only person waiting around for the result, and another young woman had gotten tested right after me, she assumed I was her without checking my name first.