[header] How to make everybody happy around you [title] Be positive. [step] Spilled root beer all over your blouse? Just laugh it off. If you have a new blouse, change, but if not, just tell your friends how hilarious it is. 
Painted a beautiful painting only to have your brother ruin it with a bucket of water? Just smile and say that he's a kid (kindly), and that we all mess up sometimes. If people press you, say it was a fun experience painting, and that you didn't really have room for it in your house, anyway.