This girl's boyfriend and his roommate made a couples costume*, so she dressed up as a Third Wheel...

reddit.com
*They're both "ceiling fans."
And spent all night photo-bombing other couple-costumes. Here she is with Mario and Luigi.

Two in-love hippies... And a third wheel!

An attractive doctor and nurse couple... And a thrilled third wheel!

BFFs forever, Wayne and Garth... And a third wheel!

Creepy scary zombie nurses or doctors... Aaaand a third wheel!

An adorable cat and a cheerful bunny... And, you guessed it, a third wheel!

Well played.

Paramount Pictures. / Via msn.foxsports.com