Reddit user ValjeanLucPicard (great username, by the way) made a spoooooky discovery while he was planting flowers in his backyard in Costa Rica. According to the album description he uploaded on Imgur, he was digging holes when he hit a piece of glass. He ended up digging more and pulled a jar out of the ground.
The top of the jar was secured with tape, but OP was like, "a spooky jar filled with a thick, dark liquid that I found buried in the Earth? I should open it!"
I'm sorry sir, but have you ever seen any scary movie ever? Are you actively trying to release a demon?
I figured it might be old money or drugs or even a time [capsule]. I pulled the tape off and opened it up, and floating at the top was a picture of my landlord, when she was much younger. My wife went to go get the landlord [because] she knew right away it was some brujeria*. The landlord came over and was just as surprised as we were. She said it was definitely the lady who lived here before, more than 15 years ago. Inside there was also strand of fabric, seemingly from a dress, and a piece of paper that had writing on it, more than likely a curse.
*Brujería is the Spanish word for witchcraft.
Well, apparently the landlady didn't take too kindly to being cursed or hexed or whatever, and she demanded all the items be burned immediately.
I would have read what it said but she insisted we burn it all immediately to 'lift the curse'. After which she poured holy water on the ashes and in the hole. Oh, the muck inside the jar had a sickly sweet smell and had the consistency of runny marmalade.
Despite the creepy display, many commenters on the post are speculating that the curse was hardly a curse at all. Judging by the sweet smell and sticky texture of the substance in the jar, many are saying that this was likely a "Honey Pot Spell," and is usually used to "sweeten" the person the spell is aimed at.
Maybe the tenant was about to be late on rent and needed otherworldly powers to not get evicted?
Oh and as for the whole "lighting the jar and its contents on fire" thing? According to this article entitled "Witchcraft for Beginners," that is a bad move.
One thing I do not recommend is throwing it into a fire, as is mentioned in some sources. This was in particular a method of cursing and curse-breaking; the Witch would throw the jar into the fire and when it burst it meant the curse was working (torturing the person it is cast on) or it meant the curse you were lifting has broken. This is not necessary, and not a safe option at all.
Whoops! Happy Halloween.