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"You built this yourself?" said the Doctor, tilting his head this way and that as he inspected the cardboard box. "Very impressive work. Adapted from a basic Transmogrifier design, am I right? 'Course I am. Brilliant!" He clapped the smugly beaming kid on the shoulder, then patted the box on one of its flaps. "Well, have fun!"
"That," said Donna when they were out of earshot, "was so cute."
"Cute," said the Doctor. "But dangerous. Not to worry, though. They won't be going far without this!" He pulled a ragged sliver of cardboard out of his pocket.
"Wait. Did you cut that off the box?" The Doctor nodded. "Oh, my God. You just... You just sabotaged that little boy's cardboard time machine?"
"Well, I couldn't let them go on using it, could I? A quick trip back to terrorize a few hapless dinosaurs is one thing, but can you imagine the evil that could be unleashed across time and space by a seven-year-old with an active imagination?"
Donna made some sputtering sounds.
"Anyway," said the Doctor, "it was the tiger's idea."