Coincidence happens all the time. However in the recent Kalachakra Puja by His Holiness Sakya Trizin at the OCM Indoor Sports Centre, Kuala Lumpur, I believe it is more than pure coincidence.
The Sun is set exactly above the head of His Holiness during the climax of the puja. The shrine and stage where His Holiness seated was glowing although I have no idea how it actually happened (perhaps science can, I'm not sure). And right after that a flock of bird actually flew by outside and too bad I did not managed to capture it. But there's a guy in front of me who captured everything on his video camera.
Many people did witnessed that magical moment that evening.