Ladies, what is the most obvious hint you've dropped that went unnoticed by a guy?

Oh, I have so many stories, from the male perspective.
Each one I look back on and realise I missed some obvious signals, but in my defence media has taught me a signal isn't always a signal and i didn't want to be a creep.
I always figured if a girl was into me she'd say so directly.
Anyway!
1. From about age 12 I had a friend with older sister (she was about my age, the friend was younger than me).
I became friends with the sister over the years by association.
Fast forward 6 years, my mate is having his 16th birthday party. His sister asked if I was going, which of course I was, it was a sleepover with video games, pizza, movies and no parents in a giant house.
She said she was glad because she'd be the only girl and didn't like the other boys.
During the party she asked me to come check on her in her room in 10 minutes. 10 minutes go by and I wander off away from the party to her room at the other end of the house. She's sitting on her bed in just a tank top and panties.
Being the gentleman, i assume nothing and sit down o. The floor to chat. We talked for a couple of hours, had this great connection...A few times she asked me to sit on her bed and I just said I was fine on the floor. Eventually she said she was tired so I bid her goodnight and went back to the boys and went to sleep.
Years later I thought about that night and realised I'd probably missed an opportunity. I ran into her shortly after and asked her if I'd missed some signals. She said she yes, I'd definitely missed signals. She specifically didn't have plans that night and didn't have her own friends there.
No hard feelings, but damn did I feel like a goof. 2. While working in a boring retail job on checkouts late at night, this cute girl I worked with would always be sending me little notes via other staff.
I'd write back, and we'd smile at each other.
It made the nights go by much more quickly.
I was totally oblivious to the googly eyes she made at me, the way she flirted with me, even changed her shifts to be on nights with me. Which I knew, but didn't put it together. I just thought we were friends.
After about 6 months of this she announced she was leaving the country to become a vet and asked me if I could think of any reason she should stay. I told her she should follow her dreams and had my support. Never heard from her again.
Pretty sure that was a missed opportunity.
. There are more, but it's making me cringe so bad just thinking about them...

/r/AskReddit Thread