Number theory why did the little boy wear a sheet to go trick or treating

Number theory deals with numbers and it is used in the mathematics.
The boy wear a sheet to go for trick or treating because he was dressed up as a mattress or may be he thought he dressed like a ghost.
Trick or Treating is a Halloween custom which are used in many countries, in which children wear different costumes and some knocked at doors of others and say trick or treat.

The repetition of initial consonant sounds is called alliteration