[Despite Geralt’s complete lack of lyrical talent, he doesn’t have to do much thinking before providing the offered limerick. All those nights spent listening to Dandelion murmur about rhymes had finally found some use.]

There once was a doctor who felt flat,
For his towns people thought him a rat.
And then came the day,
That he said 'hooray',
For they now thought him a swarm of bats.

[As far as limericks go, it's... not great, but it's about the standard one can expect from a man as lacking in musical talent as Geralt. Particularly after he's downed five glasses of gin.]