When we started seeing each other, DH would always do a sweep of his flat for dead offerings from MCat before I arrived. He got quite flustered once, when he could smell one but couldn't find it. Usually he'd follow the row of ants.
And talking of MCat, I've just had to pull some crumby black stuff out of his whiskers. He's also trying to climb on my lap, which always ends up in him biting me. We've compromised for a proprietary paw on the leg.