Combine them. There's a puzzle early on centred around figuring out the difference between Asgore's (illegal/recreational) opioids vs Undyne's (legal/medically necessary) opioid medication. Presented as somewhere between that one riddle with the two guards [insert mandatory Royal Guard pun] where one tells the truth and the other lies and two clones both trying to pass as the original.
Also there's dialogue like:
Susie: Man, I can't believe Officer Undyne does drugs!
Noelle and/or Ralsei: Hey it can also be a painkiller... but surely only one could be hers...
Susie: I still think it counts.
Noelle/Ralsei: No. It. Doesn't!
Susie: What do you think Kris?
*Kris is stuck staring blankly at the "it counts as drugs/it doesn't count as drugs" options while the player wonders what the hell that was*