Let's make this birthday one to remember.

47 years old (Born on May 15, 1978)

Happy Birthday, David Krumholtz! May your day be filled with more joy than Charlie Eppes had equations scribbled on chalkboards. From solving crimes using math in "Numb3rs" to charming us all as Bernard the Elf in "The Santa Clause," you've calculated your way into our hearts.

Here's hoping this year brings you even greater success—perhaps a role where you're finally allowed to leave the whiteboard behind and just relax. But let's face it, we'd still secretly hope for at least one scene of you passionately explaining complex theories nobody else understands. Cheers to another year of brilliant performances!