Mistletoe
"Not another one," said Rory, reaching up and plucking down the mistletoe that was hanging from the TARDIS ceiling. He slipped it into his pocket and carried on down the corridor towards the control room.
The Doctor hung the mistletoe above the TARDIS door, humming to himself.
"He's not going to fall for it," Amy said, amused.
"Your husband is a spoilsport," muttered the Doctor. "It's just a kiss."
Rory entered the room and spotted the mistletoe.
"I'm not kissing my wife underneath that for your benefit!" he exclaimed.
"I feel quite offended by that," said Amy, making Rory blush.