Frosty the Snowman! That was the first thing he said when he came to life and that is usually what I say unexpectedly throughout my day. I’ve found that I have to explain that, because the first thing a person would say is; “oh, is it your birthday”? I then would follow up with; “no, it’s just something I say to keep me in a celebratory mood”. I usually is followed by an awkward silence, but it tends to catch on. I know, I’m just happy like that. I would encourage you to try it.