Cat owners, can you help me?

So I’ve got these two big ol’ boys, Arnie and Bob. They’ve both been living with me for around 2 years and usually cause very little trouble. For the past 3 days, they have both been acting out, and I can not, for the life of me, figure out why. Bob has pooped right in the middle of the living room twice, and Arnie has pooped and peed right in front of the litter box but on the floor. Neither one of them has slept on my bed for the last 2 nights. Today, Arnie got on top of the refrigerator and tossed a ceramic bowl I had up there right onto the kitchen floor, and Bob is now jumping from the sofa to the dining room table, thereby disrupting everything on the surface and knocking it to the floor.

I’m at my wit’s end. Before you ask, yes. They have plenty of food, they have plenty of fresh water, they have lots of cat treats, their litter box is clean, and they have plenty of cat toys to play with.

So what gives? I think this is a behavioral thing, but is it possible that they’re both sick? If it’s behavioral, what would make them both so upset at the same time? Thanks for any insight you guys can offer.