A man rooting around his medicine cabinet found one of his ex-girlfriend’s old pregnancy tests. Because he was bored or felt like peeing on something, he took one of the tests, and much to his surprise, it came back positive. "Lol,“ he thought, probably. He told his friend about the ordeal, who then turned the humorous tale into a rage comic and posted it on Reddit.

And that’s the decision that saved his friend’s life.

Science fact: pregnancy tests detect beta human chorionic gonadotropin, which is not only a sign of a potential pregnancy but also, in some cases, testicular cancer. Several Reddit users knew this and told the man to get to a doctor.

"You may have testicular cancer! Get to an oncologist, tell them you took a pregnancy test and it came out positive,” one Redditor wrote.

Another wrote: “If this is true, you should check yourself for testicular cancer. Seriously. Google it.”

The rage comic artist alerted his friend, who set up an appointment with an oncologist. It turns out that Reddit was right; the man had tiny tumor is his right ball.

Of course, the Reddit user announced the news with another rage comic.