I remember many years ago, me and a buddy got $100 to clean out an old woman's garage in Terrasse Vaudreil, it was full of old stuff that she didn't need and she basically said to throw it all out.
Among the junk, we found 5 fairly large mirrors with carved wood frames, they were actually pretty nice and we figured they're probably antiques - So we set them aside and when we were finished we took all of them to the antique store in Ile Perrot.
The fat dude at the antique store came out, looked at them quick and offered us $50 for all of them... He went back in the store and basically said bring them in if you want the money. We thought about his lowball offer, and basically said what the hell, it's free money. So we started unloading them and placing them against the truck.
This woman in her 40's drives up and starts looking at the mirrors, and starts saying "Wow, these are wonderful! how much do you want for all of them?", we both look at each other confused.... "I don't know, we already got an offer from the antique store, what are they worth to you?"
She says " how about I give you guys $300 for all of them".
Being an opportunist I replied "400 and you got a deal".
I know for a fact that this isn't the most money I ever made, but when you're 18 years old, and all your care free life consists of is going to school, working part time in a crappy student job, and partying with your friends - This was definitely one of the most memorable "free money" moments. We ended up walking away with $350, and we partied like rock stars for most of the week after.