oh and the joke is that 2:30 is "dentist time" because of how it sounds. that's not a joke I made up, that is a thing that people say sometimes!

Oh, i get it. Tooth hurty! I have never heard that. In my google quest to decipher the joke, i came across a dental office called 230 dental and i remained perplexed. Should have sounded it out, but my brain doesn’t work well in the mornings. Thank you for the explanation!