Bert and Ernie are two of the most popular characters on the iconic children's show Sesame Street.
The creator of The Muppets, Jim Henson, and master puppeteer, Frank Oz, brought these characters to life. Interestingly enough, the roles were initially reversed, with Oz performing Ernie and Henson performing Bert, but after the very first day of rehearsal, they switched.
The characters represent unconditional friendship despite their seemingly conflicting personality traits, and are said to have been based on the relationship between Oz and Henson.
Another fun fact is that their names come from two small characters in the Frank Capra film It's A Wonderful Life.