On Wednesday, General Motors held a special event in the U.S. to announce the launch an all-electric version of its Chevrolet Spark. But it didn’t go as smoothly as the company had hoped for.

You see, according to a report from the Wall Street Journal, during the event, computers displayed a derogatory remark after any mention of certain GM competitors like Chrysler to the 200 members of the media who were using the company’s internet network.

GM spokesman Selim Bingol said that the company had nothing to do with the incident, in which the word “sucks” was displayed after every search or reference made on web pages to select Chevrolet rivals, namely Ford, Chrysler, Toyota and Honda.

Later, the Detroit automaker said that its technicians found the culprit: an unauthorized program that was altering the way web pages were displayed, inserting the aforementioned word, was installed by a subcontractor, who wanted to pull off a prank, on one of the network’s wireless routers.

The company did not identify the subcontractor, but mentioned that GM’s other networks were not affected. “These guys are learning the definition of sucks”, said Bingol.

For some reason, competitors Nissan, Hyundai and VW were excluded from the subcontractor’s software prank.