Limerick of Richard Dadd

Titania Sleeping (1857); Richard Dadd
An English painter named Richard Dadd
 went completely stark raving madd.
  He stayed in asylums -
  Broadmoor to Bedlam.
 For stabbing to death his dear old dadd. 

Francisco de Goya Clerihew

The Madhouse (1812-19)

The work of Francisco de Goya
 shows a touch of paranoia.
  Worry of going insane
  can cause quite a strain.