Grammar Thought

Who's vs. Whose. 

Who's is short for "who is" or "who has." 
Example: "Who's coming for dinner tonight?" is short for "who is coming to dinner tonight?" 

Whose is the possessive form of who. Example: "Whose book is this?"  Means, who does this book belong to? 

Can you think of other examples where "Who's" would be using instead of "Whose?"