Mine?
I snooped and found out my SO was going to propose on my 20th birthday.
I was so nervous he was going to do it in the restaurant. Because of my social anxiety and everything. He didn't, and it was what I expected from us at the time in our lives, but eh.
Kinda wish i never found out, but still. Whats done is done.
And no, Im not telling y'all how I found out.
Being in traffic and watching someone go off the side of the road to get into a turning lane or offramp.