I'm trying to find a snappy way of distinguishing between the following cases, both of which involve someone enjoying something unexpectedly.
1. Anne comes home to find her friends have arranged a surprise party. She really enjoys it.
2. Bob knows he is going to a friend's party that evening; he does not think he will enjoy it. But he goes nevertheless and ends up having a really enjoyable time.
(And we might even add 3. Charlie spends the day agonising about a friend's party he has to go to that evening. His afternoon is ruined in dreading the thought of it. Be he goes, out of duty, and ends up having a really enjoyable time.)
The pleasures that Anne and Bob enjoy at their respective parties can both be called, I think, 'unexpected' or 'surprise' pleasures. I want a pair of labels that will clearly and concisely distinguish them.