He woke up in the middle of the night by a soft buzzing noise. A mosquito! He grabbed after it. He slapped after it. He slapped himself where he thought it might be sitting, but it happily buzzed on. He lit the light and tried to find it. The buzzing continued, but he could not localise it.
"Stop that cowardice!" he shouted. "Come out and fight like a man!"
It was only then he remembered that he was Merlin, the wizard of all wizards. In two seconds the mosquito grew to six feet. It pulled its sword and held it against Merlin's throat, as it made a tiny hole with a dagger on Merlin's wrist. The mosquito drank half a drop of blood. Then it buzzed off.