A DRIVER was left shocked when he learnt the proper use for a slot on his car petrol cap.
Justin, who posts on TikTok, revealed the mind-boggling discovery about the fuel cap he once thought was useless.
In the clip, he shows himself removing the fuel cap from his car, as if he was going to fill it up with petrol.
He then points to a ‘slot’ on the fuel door and hangs the cap on it.
And in a voiceover, he says: “38 years on this earth and I just learnt this.”
The original video, posted by @milltj01, has gone viral – with over one million views and 45,000 likes.
After watching the clip, others have had the same revelation and have tried the trick out for themselves.
One man, posting under the username @aketton, responded to the original video, saying: “No, I’m not having that. Oh my days.”
He showed his 64,000 followers how his car also had a slot for the fuel cap.
In absolute disbelief, he held his head as he rushed to another car to see if the hack worked on other vehicles.
In his second attempt, there wasn’t a slot – but instead, the door has a small hook on it to hang the fuel cap off of.
He said: “How did I not know that. I normally let it dangle and knock about like that.”
This isn’t the first hack that people have learnt from the social media app.
TikTok users were blown away last week by a hack that shows the “right” way to flip a grilled cheese sandwich.
The hack was shared by user donnabonnana – and had people dubbing it a “game changer.”
The TikToker said in the description that she learned the tip from her husband, Patrick.
“My husband was excited…he said you should do one of those ‘i was today year’s old…’ videos and show them how i flip my grilled cheese sandwiches.”
In the trick, her husband put his spatula under his grilled cheese and picked it up.
Rather than flipping the grilled cheese over, however, he picked up the pan.
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He then turned the pan upside down, and on top of the grilled cheese.
Holding the grilled cheese to the pan, he then turned both of them over in one seamless move.