We often see an upsurge of humor inspired by tragic circumstances: this happened also during the Coronavirus disease 2019 (Covid-19) outbreak. However, little is known about the emotional response to tragedy-triggered humor, let alone Covid-19 humor. With a large-scale survey completed during the early stages of Italy’s lockdown, we studied the appreciation (funniness and aversiveness) of different formats of Covid-19 humor shared on social media. Results of an analysis of the role of demographic, personality, and psychological distance factors with linear mixed models showed that Covid-19 humor lacks a “signature” of funniness, but displays a mark of aversiveness. Among demographics, age and gender were key factors: with increasing age and in women, Covid-19 humor was judged as more aversive. Individuals using humor to cope with uneasy circumstances judged Covid-19 humor as funnier and less aversive. Furthermore, the perceived risk of infection amplified Covid-19 humor aversiveness, while kilometrical distance from the first Italian contagion hotspot raised the amusement in global terms. These findings expand our knowledge about dark humor and should raise awareness of the great variation in the emotional impact of Covid-19 humor and of the need to ponder where and with whom to share the laugh about the pandemic.