First lock the launch window so the satellite’s orbit intersects the Moon’s line of sight at the exact moment you want the joke to “tickle.” Then tie every on‑board clock to GPS and a ground‑station master clock, trimming any drift to microseconds. Encode the joke in a robust modulation with strong forward error correction so the message survives cosmic noise. Use a phased‑array antenna to steer the beam precisely at the Moon’s sub‑point, and run a dummy burst test on a previous flight to confirm timing. That keeps the joke on schedule and the signal clean.