Number one joke shop in all of London
Located at 93 Diagon Alley

Image from http://www.happilycandied.com/2014/11/wizarding-world-part-1-adventures-in-diagon-alley/

Weasley Wizard Wheezes is waiting to enitice you with the best jokes, toys, and practical items. Hurry in today to see what new product will have you wheezing in laughter!