Fan-favorite couple Penny and Leonard were at the heart of it all.

The character of Penny, played byKaley Cuoco, was a hit from the beginning (viaScreen Rant).

She also ended up falling in love with her neighbor, Leonard, portrayed by actor Johnny Galecki.

The Big Banh Theory cast

Penny and Leonard’s relationship didn’t make sense on the surface, of course (viaThe Things).

They didn’t appear to have anything in common.

She was an actress who liked to socialize and watch sports.

Kaley Cuoco’s Big Bang Theory characer, Penny

Despite it all, something about the pair just seemed to click.

Not much is known about her life before moving in across the hall from Leonard and Sheldon.

In fact, the series never even revealed Penny’s last name to viewers, (viaInsider).

However, that didn’t matter much, because fans instantly fell for the lovable character.

While the theory seems unlikely, some fans may now watch reruns of the show with fresh eyes.