If a police officer ever pulls you over for speeding and asks, &amp;quot;Do you know how fast you were going?&amp;quot; an insightful, though perhaps unwise, reply would be, "Relative to what?"
Se vi fermassero e vi chiedessero:  "A che velocità stavi andando?" potresti rispondere: "Rispetto a cosa?" Una risposta acuta ma poco saggia.