triangle shape object with flashings lights

After seeing this we never discussed or mentioned anything about again it until maybe a few years ago. 
I was around 15 or16 years old at the time and me, my sister, and a few friends were sitting on my porch, joking playing like normal teens. 
Suddenly all the street lights went out, and this strange triangle shaped object with different colored lights appeared over the vacant lot across the street from my house, with lights flashing around it.  
It just sat for about 30 seconds to a minute, then just shot away like a bolt of lighting.