When I've got a slight headache, I take two paracetamol. But when I've got a raging headache I reach for ibuprofen.
I don't know for a fact that ibuprofen is more effective than paracetamol. But the word - "ibuprofen" - sounds more ... angular in my mouth, than "paracetamol".
It's Bouba and Kiki all over again.