The actual funniest thing about the way Deltarune Chapter 2 start isn’t even how it confirmed the “KRIS IS JUST GONNA SLICE THEMSELF A PIECE OF PIE IT’S FINE IT’S FINE EVERYTHING’S FINE” theory after three whole years of speculations (I mean, that is still pretty funny)

But the funniest thing is this:

This isn’t just some random knife they snuck in from the kitchen to eat pie and summon Dark Fountains, it’s specifically THEIR knife, and it’s a knife Toriel can recognize at a glance. It’s just a known and accepted fact in the household that Kris has their own personal trademark knife. 

It’s just… this is the knife of Kris, the knife that belongs specifically to Kris, Kris’ knife. And considering how they pulled it seemingly out of nowhere in the ending to both chapters, it seems likely that -despite never showing up as an Item - Kris just carries this knife everywhere and everyone just had to learn to accept it. It’s their Emotional Support Knife.