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Prof is good enough kill Sans in the ninth run, but what if the player is really bad at platforming and/or have arrow keys that are barely larger than tit-tats?
that's the expression of someone who's died seven times in a row.
nope, wait, that's definitely nine, sorry.
or was it ten?
that's the expression of someone who's died ten times in a row.
let's invite all your friends over for a big shindig.
we can have pies, and hot dogs, and...
you don't have any friends.
that's the expression of someone who's died eleven times in a row.
well, give or take.
there's nuance to this stuff.
don't think i'll be able to count very well from here.
count for me, ok?
we'll start from 12.
And when you are bad enough to keep dying after that...
Please never change, Sans. 
And genocide run is definitely not for me - I can't even live through the second round after the opening.