sleepovers have become common among the pittlings, largely because Victoria wants to get out of her parents and Dennis and Trinity already live together.
Slowly they start including Mel and Cassie and Samira and even Langdon that one time ( Mel dragged him to a bar with them and they had an impromptu sleepover, Trinity was not happy). It extends to including night shift doctors on occasion. And the interns join sometimes, for enrichment.
After Dennis begins house sitting for Robby, they started having their sleepovers there. Afterall he had a big ass family house in the suburbs, with beds for everyone and a background with a hot tub.
Now technically it's not a party, it's a sleepover, maybe even a meeting amongst the pitt staff, if they really want to bullshit. During one of the get togethers, a few people get drunk/high/over caffeinated. Dennis and Jack go into Robby's bedroom, jack is insisted on sleeping in it and Dennis is suggesting he leaves the room alone.
And Jack starts saying that nothing bad is going to happen, and invites Dennis to use Robby's shower and lay in his bed, then jump in his bed.
He latter turns out to be a very bad idea, the two very quickly break his bed. Dennis is obviously very panicked when it happens, borderline panic attack, so jack is the one to tell Robby.
He texts "me and Dennis broke your bed, my bad 👍" and doesn't check his phone for a few days .