The clap of our hands shall be heard throughout the universe!
(or at-least bring a smile to our faces)
(1) “Excuse me, couldn’t help noticing, but you look like you could use a high five.” (hold hand up)
(2) After some friendly chit chat, small talk, “Know what? I think I need a high five.” (hold hand up)
(3)Walking down the street, (hold hand up, make eye contact) "Random high five!"