T-Rex: If you're dead and you're a ghost, why are you still hanging around? What unfinished business could be SO IMPORTANT that it demands the full attention of your new supernatural powers?? Give it a rest! Game over, man!

Devil: T-REX YOU TALK LIKE YOU'VE NEVER GONE FOR 100% COMPLETION

T-Rex: Oh my gosh THAT MAKES TOTAL SENSE. Ghosts have beaten the game but they've worried they've missed something, so they're hanging around, going for 100%! That's their "unfinished business"!
Dromiceiomimus: "I died without ever messing with a lightswitch while throwing cups at a wall"?
T-Rex: Exactly!
Devil: ACHIEVEMENT UNLOCKED: TIME ON YOUR HANDS

Utahraptor: And ghosts hanging around from hundreds of years ago?
T-Rex: They just suck at the game!

T-Rex: They've spent HUNDREDS OF YEARS but they're still in the same spooky mansion, trying to get that last "Get Photographed Clearly" achievement required for 100% and messing it up, Every Single Time.
Utahraptor: Aw, poor guys!
T-Rex: Whatever! Come on, ghosts!! Have you tried NOT being blurry and transparent?

T-Rex: This may sound really obvious, but I don't want to leave any stone unturned here.
T-Rex: I find that really helps me when I'm being photographed.