"You know something, it's kind of neat getting to see a bit of my own country's history first-hand," observed Peri, idly humming a tune strangely familiar to the Doctor as the two surveyed the dusty main road of the quiet town, passing a pair of disinterested horses tethered outside the local saloon. "With riiiiiiings on their fingers, and belllllllls on their toooooooes, the girls come to Tombstone in their hiiiiigh silk hose…"
"Peri, if you sing so much as another bar of that wretched tune," cringed the Doctor, "I swear I will not be held accountable for my actions."
"Jeez, Doctor, it's only a harmless little song," scoffed Peri, rolling her eyes.