A McDonald's worker left people fuming after lifting the lid on a controversial drive-thru secret.

The worker, who shares tricks of the trade on social media site TikTok, left some fast-food fanatics so creeped out they vowed never to order certain favourites again.

Some of the secrets, from hidden cameras, to recording private conversations, put some junk food fans off for life.

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Taking to TikTok, @secretfitzz, revealed that while we're sitting there with last night's make-up on, stewing in our hungover filth, the Maccies drive-thru is actually taking secret snapshots of our unsuspecting mugs. And, not only that, they're listening to our conversations too.

"The fact people don't know we can hear your convos even when we aren't speaking to you taking your order," the TikToker explained.

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"And we have a camera at the speaker that takes a picture of you so we know whose order is whose."

She added: "Seeing the mugshots of random people makes my day."

Our sister site the Mirror reports that many people were left feeling panicked at the prospect of their monstrous mugshots and secret conversations being readily available to McDonald's employees.

"If this is true, I'm never going again," one TikToker commented, while another added: "New fear unlocked: Drive-thrus."

Meanwhile, a third joked: "How can you hear my convo when you can't hear me screaming into the mic from 5cm away?"