"Welcome home! How was it?"
"It was desperately needed! Thanks for house-sitting on short notice. Any trouble? Had enough food?"
"No trubs - and yes, you spoiled me with the money you left for snacks!"
"Least I could do for my favorite house-sitter!"
"I did have to buy more cat-food and litter; I couldn't find any. She was so hungry when I got here!"
"I don't have a cat?"
The cat in question didn't even look guilty about breaking in.