On a september night at about 11:00 pm i was jogging with a friend. the area is a suburb of north san diego county. the sidewalk we were on goes do a hill past and elementary school on the right and open field to the left. at the bottom of the hill is a culvert the flows to the field. going over the culvert there is a small rise and the beginning of a housing area. the housing area starts on the right side and within 100 yards or so, the field on the left becomes housing. it was in this transition area that we felt a vibration like a deep bass, but no actual sound. i looked up and to the left and saw a diamond shaped aircraft with red lights at each corner and a larger round blue light in the middle. i grabbed my friends shoulder and yelled "jim look, a ufo!". when he looked up and saw it we both ran to hide in the bushes by the housing on the right side of the road. the craft was now slowly moving to the east, maybe 30 feet off the ground. when we could not longer see it we started walking on our normal jogging route, trying to convince ourselves that we had not really seen what we saw.