Tochi's Hut

Daddy to Mommy: "Do you remember that place? We once found a cache there!" 
Kid: "I do!" 
Daddy: "How is that possible? We went there before you were born..." 
Kid (matter-of-factly): "I used the TARDIS!" 
Mommy: "He'd sound so dumb to those who don't know what he's talking about..."
Daddy: "But that's a most perfect and logical answer!!!!" :D