A colleague got a hot lunch, ate half of it and left the rest under her desk... until 5.30pm! The food was very visible as hers is a corner desk. This isn't the first time she's done it; last time it was a full English breakfast that also sat there for the entire day. Our canteen is open all day so there's no excuse not to return the plate. It's sheer laziness.
AIBU to think that this is not appropriate behaviour at work?