Is there a dumber place to intentionally cut than the palm of your hand?
Maybe your eyelid or corner of your mouth.
This show's creators love the tired tropes. To name a few:
Psychic Nosebleeds - https://tvtropes.org/pmwiki/pmwiki.php/Main/PsychicNosebleed
Brought Down to Normal - https://tvtropes.org/pmwiki/pmwiki.php/Main/BroughtDownToNormal
Palm Bloodletting - https://tvtropes.org/pmwiki/pmwiki.php/Main/PalmBloodletting