McDonald’s (MCD) drive-thru customers may be surprised to find out that they are being caught on camera as they order that Big Mac and fries, according to a TikTok video posted by a worker of the fast-food restaurant.

The video, which has amassed over 171,000 likes as of Thursday morning, shows how the McDonald’s workers know exactly which drive-thru order belongs to which customer’s car.

The video, which was posted by TikTok user Katie Clarke, said there is a camera at the McDonald’s drive-thru that takes a picture of the customer inside their car as they place their order. The picture is then displayed on a screen inside the restaurant to the worker, so they know who to give the order to.

Clarke also suggested that because of the camera, it is probably a good idea to “don’t pick your nose when you order… because we see it and judge you.”

As the TikTok video from Clark began to make the rounds on social media, revealing the McDonald’s drive-thru secret, fans of the burger chain were shocked that they were being filmed.

One on Twitter showed their surprise when they were actually caught by the camera, with one user saying, “I feel violated.”

Another TikTok user said, “I’m never going back there,” and another suggested that they were “getting tinted windows asap.”

But the real question that social media users wondered about was if McDonald’s was using camera images to identify customers, how do orders still get mixed up?

A TikTok user said, “And yet you still get the orders wrong,” and another said, “they still messed up ur order giving the wrong stuff.”

Other TikTok users just wanted to know where the cameras were so they could “wave and smile.”

Shares of McDonald's were trading at $214.54 as of 9:30 a.m. EST, up 91 cents of 0.43%.

Mcdonald's apologised for a sign placed in a store window in Guangzhou that said black people were banned from the restaurant
Mcdonald's apologised for a sign placed in a store window in Guangzhou that said black people were banned from the restaurant AFP / Sameer Al-DOUMY