I don’t know what time frame you have in mind about instant, but if a few days still counts here is mine. (Actually it took a few days to find out, the karma would have been pretty quick).
A bit over a year ago I went on a spiritual/mysticism specialist tour of Egypt. Unfortunately we had a lady on the tour who was a bit of a nightmare, constantly rude to people, quite a narcissist always wanting to seem the most knowledgeable spiritual superior etc (a definite NPD candidate). Because it was a small group speciality tour it was difficult to get away from her. Of course the whole time she saw herself as the victim and it was a case of everyone being mean to her.
One of the features of this tour was special / private access to a ‘living’ statue of the goddess Sekhmet, in the Karnak complex. A living statue is one that the ancient Egyptian priests and priestesses are supposed to have imbued with special energy and power (this statue is the only one known still in Egypt). One of the things the goddess Sekhmet was about is as an enforcer of the sacred laws (mostly about how to behave and treat people with respect), she is supposed to punish bad deeds. Pestilence and other similar calamities are the typical punishments. When we had our private access this woman was in a mood and at the end of her turn with the statue she had to be asked to leave (despite strict instructions we had to stick to our allocated time to be fair so we all had the same amount of time). She pitched a fit having a toddler tantrum saying ‘I don’t want to finish’ etc and shoved our tour guide, right in front of the statue! We had also been warned to behave around the statue (and indeed for the entire tour), because of the likelihood of more severe and immediate Karma.
Anyway a few days later we were back in Cairo, this woman got a call from her sister who is a real estate agent trying to sell her house. The sister had gone to this woman’s home to open it up for a viewing and she had had a sudden rat infestation! The property and furniture was chewed and scratched all over with rat faeces and urine all over the place.
The goddess Sekhmet knows how to dish out the karma!