Halloween [1] is one of those occasions that can go so very right or so very wrong. While we all hope to win best costume [2] or show up to work hangover-free, one wrong turn and the night can end in a real-life nightmare. And when you're single, that's even truer. There's the potential of running into your ex, having the lamest sexy costume ever, or throwing a party where nobody shows. But the good news is you can always grab the closest mask and hide behind it. Ahead, check out the worst-case scenarios that we wouldn't wish on our worst enemy (well, unless she was Regina George).

Source: Paramount Pictures [3]

You Have Nowhere to Celebrate

You Miss the "Sexy Costume" Memo

Your Ex Brings His Kid Brother Trick-or-Treating — to Your House

Your Frenemy Shows Up in the Same Exact Costume

You Get Hit On by Someone in a Scream Mask

Source: Dimension Films [4]

Your Costume Is Too Tight to Walk In

You Have an Early Nov. 1 Meeting

The Number of Times You Get Hit On: Zero

Your Boss Crashes Your Party

The Hot Stranger Refuses to Take Off His Vampire Teeth to Make Out

Your Costume Falls Apart as Soon as You Walk Out the Door

No One Shows Up to Your Party

You Have to Go to a Family Gathering Instead of Hitting the Bars

Your Mom Comments on Your Party Pictures on Facebook

Your Friends Bail on the Group Costume Without Telling You

You Wake Up to a Supercreepy Stranger the Next Morning