Adam's mum comes in with groceries, happy to hear his voice -- she had no idea he was coming home from Utah -- and Rose watches Adam twist in his embarrassment, that tongue between her teeth. Adam begs Rose again to take him along, but she looks at him like he's no one, and gets onboard. Mum hears the TARDIS engines as they leave, but she's too excited about her son's homecoming, and doesn't think more: "Ah, let me look at you. Six months! It's like I saw you yesterday. Isn't it funny? The time goes by like that!" She snaps her fingers. Her jaw drops.