How do you feel about singing Happy Birthday?

Do you sing it at home but not in public? Sing to all ages? Are you obligated if someone walks out with a lit candle? Do you sing it happily at the top of your lungs? Do you add the “look like a monkey, smell like one, too” or “and many moooore”?

Do you have a different version? Do you go to restaurants that have the waitstaff sing it?

What’s up with the Birthday Song?