VIDEO: Kim, Kylie and Others Share Wildest Stories About Kourtney Kardashian for Her 40th Birthday

In true sisterly fashion, the Kardashians are sharing their wildest memories of Kourtney in honor of her 40th birthday.

The star's website, Poosh, featured a video on her special day of her closest loved ones sharing the best memories they had with the reality television star.

Momager Kris Jenner said "One of the craziest stories that I remember about Kourtney was when she was two years old. She fell asleep on the school bus, going to school and the bus driver didn't see her sleeping on the bench because she was so tiny and petite. And the bus driver dropped off all the kids, Kourtney was still sleeping. He locked up the bus and went out to breakfast and that was pretty traumatizing." We'd be pretty traumatized, too.

Kendall Jenner, Kourt's younger half sister, recalled her as a fun babysitter. "My wildest memory of Kourtney is probably just when we were younger, she would babysit Kylie and I a lot. She would pick us up in her white BMW and she would just drive us really fast and take us to her house where her and her boyfriend lived and she would just make us junk food all day long and let us play video games."

Sister Kim didn't have the most positive memories, and recalled a time with Kourtney in Palm Springs. "That's where our grandparents lived for the summertimes -- and we would go and stay with them. And so they had a golf cart and we would ride the golf cart or I would beg to ride the golf cart. But Kourtney would always take her friends and my friends, turn my friends against me and I was never allowed on the golf cart. So I had to rollerblade and I would always follow them on the golf cart and she would take like fruits, because there's all these fruit trees there. So she'd take grapefruit and oranges and throw it at me and try to get me to fall and laugh with everyone."

We love hearing childhood stories of the star, and are so glad her family was willing to share them in this video.