That's because he was dressed like one ... Fred Flintstone. Tweets by mackhollins This article originally appeared on Touchdownwire: Mack Hollins of Bills arrives dressed as Fred Flintstone ...

Mack Hollins had a “yabba-dabba-doo time ... For the occasion, he dressed up as the stone-age cartoon character Fred Flintstone. Much like the iconic caveman from Hanna-Barbera's The Flintstones ...

Weird. Crazy. Wild. Tarzan. All terms that apply to Buffalo Bills free agent wide receiver, Mack Hollins. And yet all words that can't quite capture the totality of The Mack Hollins Experience while ...

Mack Hollins dressed up as Fred Flintstone. Just like today, he was barefoot and also picked a hat to add to the outfit. The Bills have the chance to play against the Kansas City Chiefs again ...

Mack Hollins arrives for the AFC Championship ... time Hollins dressed as a cartoon character. He also dressed as Fred Flintstone in the past, sporting a wig. Hollins clearly enjoys having fun ...

Life's a beach for Mack Hollins despite a wind chill of 11 degrees for kickoff for the Bills vs. Ravens playoff game.

Buffalo Bills wide receiver Mack Hollins has been likened to an untamed beast. Enter the Animal. Hollins walked into Arrowhead Stadium dressed head to almost toe - Hollins walks barefoot whenever ...

Arriving to gameday dressed as Fred Flintstone doesn't mean you're going ... Hollins admitted that he as long admired the Bills approach. Mack Hollins returns the onside kick inside the 5!

Beat drums. Beat drums. Beat Chiefs. Buffalo Bills wide receiver Mack Hollins has been likened to an untamed beast. Enter the Animal. Hollins walked into Arrowhead Stadium dressed head to almost ...

There was a 100% chance Mack Hollins walked into the stadium barefoot. Life's a beach for the Bills wide receiver. Hollins arrived to Highmark Stadium with Bills Zubaz swim trunks and an open ...