Many things...my sister, brother, and I even laugh about things that didn't seem so 'laughable' at the time...we had VERY happy childhoods...so much so...that when I was around 8...I declared that I never wanted to grow up...my father just 'chuckled' and told me I was silly...
My childhood was blessed. I grew up in an extended family...grandmothers, aunts, uncles & cousins plus Mom & Dad, bro & sister. There are many moments that come to mind. It's so bad that I will break into belly laughs if I drive past a place that triggers a memory.