Here Comes the Grump (1969)

S3E24 Madeline and the White Lie

When Lord Cucuface unexpectedly falls ill, Madeline steps in to impress a pair of American tourists interested in funding the girls' school. Claiming to be a renowned tour guide, she finds herself fabricating stories as she leads the quirky couple through the Louvre. As their adventure unfolds, things take a turn for the worse, and soon they are utterly lost. Eventually, Madeline realizes she must confess the truth about her deception to set things right.