Reynolds, 43, posted a series of photos that showcased his genuine reaction to the nasal swab exam.
As shown in the pics, which were taken by his wife Blake Lively, the "Deadpool" star can be seen before, during and after the nurse inserted the large Q-tip. And from Reynolds' reaction, the test looked like it hurt!
"Back to work on #RedNotice," he captioned the post. "The Covid Test is quick and easy. The doctor places the swab up your nose, just deep enough to tickle your childhood memories and then it's over."
"No matter what you say to him, he won't buy you dinner first," he joked, before crediting Lively as the photographer.
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Reynolds' post came just a few days after his "Red Notice" co-star, Gal Gadot, shared a similar post of herself also getting a COVID-19 test.
"Getting ready to head back to the Red Notice set💃🏻but prep looks a little different now..😳 #staysafe," the actress captioned the pic.