This isn't a creepy encounter, but definitely a situation I'm happy I got out of:
Ok, here it goes. Back in high school I went to this 4th of July party at a friends house. He held a 20\$ buy-in poker tourney and I decided to play. At least 16 people joined and I ended up winning first place. To celebrate I decided to buy my friend and I some food at Denny's before we headed home.
It was around 2AM when we arrived at Denny's and we found our seat and ordered food. At the time I did not notice the table diagonal to us that was filled with a shady group of thug-looking guys. I was still pretty wasted from the party so I didn't really pay attention to my surroundings. I started talking to my friend about winning the poker tourney and how I lucked out on the river a few times. I realized that I had to pee really badly and headed to the bathroom.
When I got back to my seat I noticed my friend looked like he had seen a ghost and his body language completely changed. He told me that the group of guys sitting diagonal to us were talking about jumping us and taking our money. I looked over and noticed that none of them were eating. They all sat there with waters and had been there the entire time. I noticed that they were all completely quiet and had their ears directed towards my friend and I. I realized that the back exit was close to the bathroom and not in view of their table, so I whispered to my friend and told him to head to the bathroom, take the exit, and get the car ready.
My friend got up and walked towards the bathroom and quietly slipped out the exit. I waited a few minutes and took the opportunity to get the fuck out of there. I looked back and noticed the guys at the table getting up quickly. I went out the back exit and booked it to my friends car. As he peeled out and headed towards the parking lot exit, I looked back and saw the group of guys running out the back exit. I saw one of them pull something big and metallic out their pocket (not sure if it was a gun or knife, not sure at all, really) as they were running towards a car in the parking lot.
We hauled ass down the main street and cut through a bordering neighborhood in case they tried to catch up to us. Luckily, they didn't manage to follow us and we quickly drove to my house. Crazy fucking ending to what was an awesome night. Don't eat at Denny's past midnight..