(You can catch this naughty skelly on one of the Fate of the Damned loading screens.)
We're on an island somewhere in the Sea of Thieves. A skeleton is handing out flyers to anyone who passes by, including a Bandana-wearing Skeleton.
Flyer Skeleton: Hey, big party at the fort tonight. You coming?
The Flyer Skeleton is really trying to sell the party to the Bandana Skeleton, who doesn't look too impressed.
Flyer Skeleton: Music, food, good times...
In the background, a Poisoned Soul Skeleton (a purple, glowing variant) makes an obscene gesture using his open left fist (forefinger and thumb closed into a circle) and right index finger. (You can see the skeleton making this gesture on one of the Fate of the Damned loading screens.) Neither the Flyer Skeleton nor the Bandana Skeleton look impressed.
The Poisoned Soul Skeleton starts to sidle off, but leans into shot one last time, moving his index finger in and out of the circle made with his left hand. The Flyer Skeleton gestures towards him.
Flyer Skeleton: Don't mind him. He's been pre-drinking since the last patch.