A new social media challenge is heating up — in a dangerous way. Massachusetts fire officials are cautioning against a TikTok trend that could spark an electrical fire.

The hot fad involves sliding a penny behind a partially plugged-in phone charger, as seen in multiple viral videos circulating on YouTube and TikTok.

While the prank may seem innocuous, the coin can strike the metal prongs, causing “sparks, electrical system damage, and in some cases fire,” warned Massachusetts Fire Marshall Peter J. Ostroskey in an advisory issued Tuesday.

Case in point: The marshal obtained a photo of a scorched outlet in Holden reportedly caused by the viral prank. In another incident on Tuesday, a student at Plymouth North High School allegedly started a fire after performing the challenge in what Plymouth Schools Superintendent Dr. Gary Maestas called an “irresponsible act,” reports Fox 31. Fortunately, no one was injured — but the accidental arsonist is now facing charges.

The students were lucky, Plymouth Fire Chief Ed Bradley told the outlet, because the harebrained pursuit can cause “damage to some electrical wiring behind the wall and a fire could be undetected and burning in the walls, endangering everyone that’s in the building.”

To prevent further TikTok-sparked infernos, Ostroskey urged parents to alert “local news outlets, school officials, and parent organizations to this challenge.” He also advised them to “not only look for signs of fire play like scorched outlets, but to have conversations about fire and electrical safety with tweens and teenagers.”

The fire marshal’s public service announcement appears to be resonating.

“Safety tip, kids, sometimes old circuit breakers fail to trip and the wires in the wall will heat up to the point of setting your house on fire,” said one commenter in response to one coin challenge YouTube clip.

“As a licensed electrician…. keep doing this kids. [S]ervice calls from issues like this is easy money,” joked another.

Unfortunately, the penny prank isn’t the only dangerous challenge circulating on video-sharing apps. Ostroskey says the reckless stunt is “similar to past viral videos that encourage unsafe behavior,” no doubt a reference to other hazardous video pursuits like the Tide pod and cinnamon challenges.

Earlier this week, click-baiting chuckleheads went viral on TikTok for eating cereal out of each other’s mouths in what the Twitterverse has dubbed a ridiculous choking hazard. On the more absurd — but harmless — end of the TikTok spectrum is the “taste test-icle” challenge.