In the Witcher series, Jaskier's performance at the local tavern led to a surprising turn of events. After his song, which included creatures that didn't exist, he realized Geralt was a witcher and announced it to the entire bar. This caught the attention of a patron named Nettly, who offered to pay Geralt to kill a 'devil' that had been stealing their grain. Jaskier then decided to tag along with Geralt, offering to help improve his image so he wouldn't be seen as a monstrous killer. So, Jaskier's performance not only entertained the crowd but also set in motion a new adventure for him and Geralt.