Me I had one of those "oh no I messed up real bad this time" moments. I was making a trip to Duna on my with my new space ship and had made a new lander to go with it. So I did all the standard things one would do intercept Duna, make orbit, land take off etc. But then I got to Kerbin orbit and I de-orbited and deployed my parachute, Then I realized I had put a drogue chute not a real parachute on the landing can. So I quick loaded to when I was orbiting Kerbin and used my last 164 deltaV to put me in a safe orbit albeit an eccentric inclined one. So I designed a probe with a claw and parachutes attached and grabbed onto the landing can de-orbited and safely landed with all my science and kerbals intact.