There’s a stupid ad for some medical product, which says “In clinical trials, the most common side effect was headache”.
A curiously evasive and meaningless statement. The moment I heard it, I immediately realized that the lab results must have looked something like this:
|Massive brain haemorrhage
|Malignant cancer of the genitals
|Death of one kidney
|Explosive cranial dispersal
|Total body ionization