I have an interesting situation on my facebook wall.
Take ten beers to a friend's house. One wins a motor.
Whose? Yours or friend's?
Basically in Cambodia there's a beer lottery you open a can and you can win another beer or money or motorbike. As far as I can tell guy brought 10 cans of beer to his friends and one of them motorbike. Who gets the legal right to keep it.
EDITED: IMHO buyer gets to keep it. As he can claim that when handling over the cans his intention was to provide the beer only (cans contents) and not motorbike. One simmilar case that could be used is
barren cow where both assumed that cow was barren, court ruled that contract invalid... Same is here I am pretty sure that buyer didn't have intent on giving moto away... Although the case above is indeed contract law and beer can is a gift and not a contract... Does mutual mistake rule applies to gifts?
Who gets to keep it? Person who bought it or person who opened the can?