HI / I don't know why

I don't know why, 
but if I'm trying to show off 
my shading trick, 
the one where you press so hard into the page that it shows up on the next one,
and then you shade over it and get clear white words,
I always write "HI".
I don't know why.
The first thing that comes to mind is "HI" 
even though there are so many things I could be writing.
"THIS NEEDS TO STOP"
"BLACK LIVES MATTER" 
and things similar
would be great to write,
but for some reason,
the first word that springs to mind is
"HI".
And I don't know why.