There was a certain 'small' ufo flying around in range of my main base. I sent interceptors to sink it but it kept landing, waiting til my ships ran out of fuel, then picking back up, moving a few hundred miles and landing again. Once my condors had refueled I'd send them back out again only to have the same thing happen. This went on for another 3 or 4 times. I don't typically like engaging non-crashed alien ships, especially at night, but this b*stard was taunting me. I'm killing them all with grenades just for sport.