Michael misses Dwight so much that he goes out into the bullpen to ask if anyone's talked to him. Nobody has, including Phyllis, who mumbling-heads, "Dwight had a big personality, and I have a big personality. A lot of times, when two people like that get together it can be explosive." Like gunpowder and Maalox.
Dwight shoots down a Staples coworker's attempts to make small talk in the break room, and gets downright rude when he finds out she's never heard of Dunder Mifflin. She THs, "I don't like him, his giant head, or his beady little eyes." So Dwight's making a place for himself at the new job that's not so different fro the old one, I see.
Andy has now taken to singing "Zombie" by the Cranberries, one of the most annoying songs of the last fifteen years with all its gratuitous register changes. Probably why he picked it. With one more helpless look over at Karen, Jim gets up and enlists Pam in his plans for vengeance instead. So here's what happens: he spills his pencil cup on Andy's desk, and in the course of gathering them back up, he snags Andy's cell phone as well. And then he slips it to Pam. The phone, I mean. Jeez.
Michael and Angela share an awkward, Dwight-free moment in the break room. The two people who miss him the most.
Later, Jim gets up from his desk. Pam gets up from hers. They both start walking. Without a word, Pam hands Jim Andy's phone. Nobody notices the drop but Karen. Pam stands guard by the water cooler while Jim climbs on a table in the back room, lifts one of the ceiling tiles, and tosses Andy's phone in. Everyone in the bullpen notices the noise as the phone clatters into place above them, but nobody knows what it means. And really, at this place, mysterious sounds emanating from the space above your head fall pretty low on the list of daily annoyances.
Later still. Cue "Rockin' Robin" by the Four Andys, coming from...somewhere. Hearing his distinctive ring, Andy starts looking around for his phone. Jim plays innocent, but while Andy is distracted by the search, we see that Pam is on her phone, grinning angelically up at the ceiling.
As part of the prep for the fiesta, Ryan uses a Sharpie to copyedit the label of a bottle of generic lemonade into "Lemoñadé." Phyllis is busy slicing up the frozen chimichangas and placing little Mexican flags in them. And Angela is sort of helping Pam to tape up the WELCOME BACK OSCAR banner. Noticing that Angela's distracted, Pam asks her if everything is okay. "No," says Angela.