I love Janto: Actually I may be remembering that wrong. The Doctor later made the remaining nanogenes good for one use. I should find the transcript to see what Jack told her. Ianto is precious to him.
Sunday: Dancing (dancing lessons, a Torchwood dance party, Torchwood prom/ball, you name it)
"I remember the roaring twenties," Jack said. "Not a bad look. The fashion came back in style for a while. That won't happen yet though."
"Not the actual twenties then?" Ianto asked. "I was wondering what the robots were doing here. What do we do here?"
"What the Doctor said. Dance. Maybe take some pictures to bring back to the hub."
Ianto pointed to the Doctor who was waving his arms over his head. "I wouldn't call that dancing."
11th Doctor. I love him and his dancing is silly.