We've all been there.

We've all looked back at an old photo of ourselves at a costume party, red solo cup in hand, pre-2008- recession smile spread across our faces. "Why would I wear that costume?!" we think to ourselves. Even Justin Trudeau has been there once...or twice...or three times. But in most cases, you just can't believe you thought those cat ears were cute or that you decided "sexy Stay Puffed Marshmallow Man" was a good costume idea. Most people don't look back at old costumes and think, "Wow! That was pretty racist and/or culturally insensitive!" You know why? Because of all the things in the world to dress up as, why dress up as something or someone that's racist/culturally insensitive? Because you're lazy and racist and culturally insensitive, that's why! Here are 13 times celebrities were just that for Halloween.

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Jack White almost became a priest.

But then again, did he? The iconic rocker has regularly beguiled the press. "I'd got accepted to a seminary in Wisconsin," he told 60 Minutes Mike Wallace back in 2005 in what seemed like a moment of genuine candor. "At the last second, I thought, 'I'll just go to public school."

Whether you believe that story or not, the blues-rock polymath, who turns 45 today, has led an undeniably punk life and crafted some of the most sacred rock music in history. Two decades after The White Stripes' self-titled debut, Jack White has remained purposefully slippery with the public. He told publications that he and Meg White, his then-wife and White Stripes-cohort, were the youngest of ten siblings and claimed that his label, Third Man Records, used to be a candy company, among other outlandish claims.

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Canadian Prime Minister Justin Trudeau is at the center of controversy after three photos of him dressed in blackface emerged over the course of 12 hours.

At a press conference on Thursday, Trudeau apologized for not knowing better when he was younger. He was a 29-year-old drama teacher in 2001 when he attended an “Arabian Nights" theme party. When asked how many times in his life he dressed in black face, he told the press, "I am wary of being definitive about this because the recent pictures that came out, I had not remembered."

While Trudeau may not have learned much from his multiple instances of donning black face, America has learned plenty. Namely, the history of minstrel shows makes darkening one's skin always inappropriate (yes, even for a drama teacher), you can never trust someone named “Justin," and Twitter is an amazing watering hole for skilled satirists, social commentators, and assh*oles to gather. Here we honor 5 unteachable lessons the Justin Trudeau black face scandal has taught us.

1. President Richard Nixon Predicted Baby Trudeau Would Become Canadian PM...And He Hated Him

2. Contrary to Scarlett Johansson's Belief, Actors Can't Play ANYBODY...

3. This Is the Universal Answer to All Current Events

4. It's Sadly Not Rare...

5. The Trump Women LOVE Him Even More Now