Freakout!

Left side of the plane. Window seat. Directly infront (or beside) the left wing.

*kaboom* and a quick white flash of light

(in my mind: HOLY FREAKING SHIT?! ano yun?!)
(silently praying a decade of the rosary)

"ladies and gentlemen... for those seated on the left side of the plane. You noticed a loud bang and a flash of light... no need to worry. It sounds worse than it really is... We just got struck by lightining. We are OK."

(still freaking out in rainy HK while waiting for the next flight)