Jim Parsons, who played the character Sheldon Cooper in "The Big Bang Theory," is known for being arrogant and insensitive like his character. In 2018, he ruined co-star Kaley Cuoco's birthday party by posting a picture of her cake on Instagram and tagging her. He also posted a picture of a baffled-looking Cuoco next to her phone with his Instagram profile open. Fans compared this behavior to Sheldon's, but Cuoco found it funny and left a comment saying she wasn't offended. The pictures have since been deleted, but the story lives on as a tale of friendly mischief.