Joking
Scholars have said that seeing a person speaking words akin to wisdom but mixed with joking may indicate insolence and reprehensible actions in religion. It is mentioned that seeing a deceased person stretching or joking is not a true dream, as the deceased is preoccupied with matters of the afterlife and does not engage in joking or indecent speech.
Per Ibn Sirin's Muntakhab al-Kalam fi Tafsir al-Ahlam