Uh roommate must have predicted the future because this is about a private key for a certificate authority using the number “4” as their whole private key recently. As well as a couple other low digit numbers

https://arstechnica.com/security/2026/10/the-internet-goes-on-high-alert-after-discovery-of-8-compromised-tls-certs/

EDIT: your roommate might have been talking about this XKCD comic https://xkcd.com/221/