While swimming in lake at dusk i notice a bright star or airplane light very high in sky, but then noticed it was moving. it wasn't in a straight line, it moved straight then stopped and made short sharp horizontal and vertical turns. it also made some swirling or curving movements. i started to think i was causing the movement because i was floating on my back in the water, so i got to a point where i could stand still and it was the object that was moving. it was very high in sky, only other light was 1/2 moon and maybe a few other visible stars. there were people at the lake other than me, but i didn't know them and they sounded drunk. while i watched it seemed to be a little harder to see, if i looked away it took me a second to refocus on it, because of that i stayed still and didn't want to turn away. a boat was approaching me at the boat launch and i apologized for being in the way. it was a couple and i felt i had to explain my odd behavior so i said to the woman "i was watching a strange light moving up anddown, sideways ect... the older woman didn't respond to what i said, just looked around at the "drinkers" and said "a lot of people here tonight." then i didn't go back to watching, people were turning on car engines and lights to leave. the motion of this one light reminds me of a time when i was 12yrs old (59 now), at home, night time around 10p, dec around christmas- 2 balls of light appeared in my bedroom and moved in circular path almost playful with each other, i didn't feel afraid (i was the only person home)... but i never forgot it and have shared my story with friends over the years... the house was in preston ct on swanton rd 06360.