The most important part of a high five is confidence.  Hmmm, scratch that.  The most important part of high fives are hands, then confidence.

And oh yes, did you see that Robbie and Bobby I helped inspire?

Yeah, this one!  Go on and click it.

↓ Transcript
red and yellow: HIGH FIVE!

red: aww, that didn't connect properly. my hand feels sad
yellow: i've made a mental note to never high five you again

red: don't do that! i'll lose confidence in ALL my high fives!

yellow: ok then. two weeks from this moment, meet me here for a single test five. it will be your last chance
red: ok!

*training montage*
*high fiving a broom with arms*
*reading a book*
*blindfold high fiving a wooden man*
*doing the splits and double high fiving wooden men*

*soon*
red and yellow (approaching high five): YEAAAAAAAAAAAH!

*hands meet*
*smack*

*mushroom cloud*

yellow: that was amazing!
red: i've been practicing