“Ask me something,” older Harry said suddenly.  “Something you’ve never told another soul.  Something that you know only you would know, which if I know it, would prove we’re the same Harry, just slightly different.”

Harry thought for a long time.  “How many lightbulbs were there?” he asked.

Older Harry smiled sadly.  “Two.  One was always broken.  They used to replace the other one with dying bulbs and forget to replace it a lot.  One time they accidently put in a new one and it was nice having a bright light under the stairs.”

“We really are the same,” Harry whispered.
我们大小哈，萌萌的（捂嘴眼冒泪花）