"My house is further than yours"
"No, mine is further than yours, we have to drive to our house"
"Well we have to drive to ours too, it's a long, long way" (bear in mind we are actually IN the car driving from said house!)
"Mine is a long long way too, very long long way"
"My dog is bigger than your dog"
"No, my dog is bigger bigger than your dog"
"No it isn't. Mine is a bigger bigger dog."
"Nooooooooo" (this child hasn't GOT a dog!) "Well, my mommy likes her house better than your house"
"Yes! My mummy is fed up living in our house."
Oh well - twas great entertainment for an afternoon, just as well I couldn't get the radio to tune in properly!