Because the sequence is always like this:
Day before vacation starts: OMGGG. I CAN'T WAIITTT. GONNA PARTAY SO HARDDD!!!
Day when vacation starts: LIKE OMGGG. THIS IS SO FUNNN.
2nd day into vacation: I'm so bored.
3rd day into vacation: Dying of boredom. e_e. When. Is. This. Torture. Going. To. Be. Over?!
And etc. Lolol. Just saying.