Hammers left-back Arthur Masuaku may have been a tad unlucky to concede a free-kick for handling the ball while lying on the ground.
But the same did not apply when he immediately repeated the infringement – this time inside the box.
Initially, the Frenchman, 22, appeared to go to head clear only to inexplicably use an arm instead.
Referee Mark Clattenburg pointed to the spot with a bemused shrug of the shoulders – and £13m Nacer Chadli, another close-season arrival, coolly sent Adrian the wrong way.
The Hammers rearguard really is the gift that keeps on giving – much to the exasperation of their boss Bilic, a former world-class centre-half himself.
Certainly, Masuaku seemed intent on living up to that unwanted tag.
If his double handball was weird, his up-and-under clearance – that went 20 feet in the air before falling on the penalty spot – was utterly off the scale.
It was a very different story eight minutes before the break when they doubled the lead – thanks to yet more inept defending.