1. Matthew McConaughey in 'Magic Mike XXL'

In Steven Soderbergh's stripper drama, Matthew McConaughey portrayed the eclectic owner of a rambunctious strip club called Xquisite. Though his character, Dallas, was one of the more memorable parts of the film, McConaughey wasn't down to oil up again for the sequel. 

In an interview with IndieWire, director Gregory Jacobs confirmed McConaughey's absence from the sequel, but didn't go into detail as to why. The reason for this remains a mystery to this day.