Not my stories, but my mom has told me a few.
First, one time my mom and my grandma were at a mall in Ottawa, (the Saint-Lauren center for people from there), and they were just chilling, talking on the escalator. When all the sudden they notice the a middle aged going up the escalator on the other side. She described them as being "an even t-shirt grayish colour". Her and my grandma were really sketched out and just looked at each other, never saying anything. They didn't speak about it until a couple months later, they were watching some show about people that had an alien encounters. They were being interrogated by gray people described to be the same as the couple they saw. It still frightens my mom, thinking about it.
She said, "something about the way they looked, and the vibes as they went were very unearthly and unnatural".
this isn't really a ghost story but, one time, when my mom was eightish. She had a dream where she was in a tunnel, that went under a river (i forget which one). Her dad was driving, and then the tunnel started cracking, and filling up with water. As she felt like she couldn't breath she woke up.
Months later that tunnel collapsed and, i believe twenty? people died. I wish i had an article to back this up, but as i said i don't remember the name of the tunnel. It was somewhere in the ottawa/montreal area though.
Also one time when i was little, i was messing around in the kitchen, playing with my lego. When my mom walked in to the kitchen she noticed, that our kitchen smelt just like my great grandmothers kitchen. It was just like when she would sit down in her kitchen, to eat and talk. it was a really unique smell. Kind of like new plastic, but very distinct. She got freaked out and even called my dad at work about it. 3 days later my great grandmother had a stroke, and passed away soon after.