For some inexplicable reason, nobody can resist petting a stranger's dog on the street. Provided the puppy is cute as hell, it's totally fair game to make any person stop and wait while you manhandle their pet, interviewing them about the little guy's name, age, birthplace, whether they're a good boy or not, if they love you, etc.
For those brief moments while you're hugging -- yes, hugging -- this stranger's little champ-champ, don't you wanna take it? If only for the afternoon. Just pick it up and declare "I'll be owning him now"?
What if you gave in? What's the worst that could happen?
They can't outrun you, could they?
This sketch provides the answer.