Balloon can be used for Celebration. Balloon is related to Inside. Inside is related to Head. Chin is part of Head. 
Legal is related to Plea. Plea is related to Beg. Beg is a type of Plead. 
Celebration <--UsedFor-- Balloon <--RelatedTo--> Inside <--RelatedTo--> Head <--PartOf-- Chin 
Legal <--RelatedTo--> Plea <--RelatedTo--> Beg --IsA--> Plead 