Let's say I was in this situation:

I got a cel from Person A who really liked the 
cel but bought it as a present for me because 
Person A knew I wanted it.  Say that I decide to 
sell this cel off without even consulting Person 
A if she wanted it back.  What would you think of 
me? 

Remember:  This is just a hypothetical thought 
question.  :)  Just to make you think