Weasleys' Wizard Wheezes
Where Zonko's joke shop used to be is the location of Weasley Wizard Wheezes. Inside, you'll find all the genius and hilarity you need to get you through those grim hours at school. George Weasley is currently the owner of the establishment, and is helped out by various family members, namely Ron. This place is always filled with kids.
As soon as you walk in, there's a little plaque that states:
R.I.P.
Fred Weasley