My grandfather is 84 years old and has been drinking 1,5 - 2 liters of red wine a day for the last 20 years. During the Corona crisis, his children did not want him to drink so much because he’s used to falling and they usually have to take him to the hospital. However, during the crisis, the hospital was repurposed only for emergencies and those infected with COVID-19.
So his children added water to his wine to make it weaker.
Grandpa immediately noticed that something was wrong, but he thought that the problem was with him, not his wine. As he’d been listening to the news for several days, he heard one of the symptoms of COVID-19 was a loss of taste. He called his doctor and went to the hospital to get tested before his children found out about his suspicion.