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The Spanish club hosted Sociedad at the El Madrigal for their La Liga clash on Saturday.
And Villarreal took a 1-0 lead into half-time thanks to Parejo's wonder strike early in the first half.
Villarreal striker Paco Alcacer had his effort from inside the box blocked by a Sociedad player.
However, the ball fortunately ricocheted into the path of Parejo, who took a stride before unleashing a powerful strike into the top corner of the net.
A helpless Alex Remiro could only watch on as the ball flew into the back of his net and handed Villarreal the advantage.
Fans wasted no time in flocking to Twitter and commending Parejo for a wonderful opener.
"He learnt that at #LoftusRoad whilst on his loan from Madrid to #QPR back in the day," Twitter user Scott Crowley wrote.
While a second tweeted: "Wow. As a Valencia fan that hurts, but wow."
A third, Joe Totale, responded: "Could have taken someone's head off."
And a fourth fan said: "A real thunderb*****d [sic]."
Valencia fans were furious after Villarreal snapped up Parejo on a free transfer last summer.
The 31-year-old Spanish midfielder claimed that he wanted to retire at Valencia before making his shock move to their local rivals.
Parejo told Radio Marca at the time: "I am comfortable in Valencia, it is a top city. My family, my children, they are all perfect in Valencia.
"I have been at the club for nine years and for me it is my home and that is how I feel. I have two years left here and I would like to retire at Valencia because of my career.
"But football is football and you never know what is going to happen, but for me, Valencia is the most important thing."
Featured Image Credit: Premier Sports/Twitter
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