This wasn't scary for the crew in a 727 departing STX at night with rainshowers in the area. I was the FE. Climbing thru 2 or 3 thousand with nothing on the analogue radar showing a need to deviate we get a ding from the FAs and Captain tells me to check with them. FA tells me "what was that?" I ask what she means as we have no indications or sounds up front. She says that a bolt of lightning hit one wingtip, came in through a window and flashed up and down the aisle, went out the other side window and hit the other wingtip. I open the cockpit door to a dark cabin with only white eyeballs visible like you might see in a cartoon. They check and nobody injured, no damage in cabin and we have no indications up front and press on. Post flight we find both wingtip tail lights melted.