Flew Jebediah to the Mun, collected science, and then started ascending to rendezvous with the service module but then I realized I didn't give enough fuel to make it back to the module. I aborted ascent with enough fuel to land. Getting him (and his science) back was a doozy: First, I built a vehicle carrying 3 communication relay sats and put them in KEO. I eyeballed the resonance so they're in an isosceles triangle. Whatever, it worked.

Did the same thing in polar orbit around the Mun (with an actual 1/3 resonant orbit precalculated this time).