I was driving home with my girlfriend when we noticed a strange light in the sky that changes color and have a pulsed light. i immediately thought it could not be a plane or a helicopter because of the type of lights ,that alternated (white, red, green, yellow), and for the type of flight. when i see it i was quiete surprise but when i hear dogs barking with too much strong i came immediately in my home and when i ve come out after an hour circa, there was no trace and everything in silence. i don't know exactly what i ve seen, but it wasn't certainly a plane.