Watch: The NRL's biggest brain explosion?

Greg Inglis lines up the fateful drop goal. Photo / Getty

Greg Inglis has had one of the NRL's greatest brain fades.

The South Sydney superstar stepped up to be a hero, attempting a field goal with seconds left on the clock.

The only problem? The Rabbitohs were down by two.

"It's 8-6, Greg," Ray Warren.#NRLDragonsSouths#NRL https://t.co/MRj92Ui7NU

— NRL (@NRL) March 20, 2016

Inglis' attempt at the one-pointer had people wondering whether he had confused himself with rugby's rulebook, where a drop goal is worth three points.

Is that Greg Inglis telling us he's ready to switch to union? #threepointfieldgoal

— Jamie Pandaram (@JamiePandaram) March 20, 2016

Subjects Greg Inglis failed at school: 1. Geography 2. Maths

— Dragons Supporters (@M_B_D_S) March 20, 2016

Down 2, goes for 1. What was Greg Inglis thinking? Would've been hilarious if he'd slotted the FG and began celebrating... #NRLDragonsSouths

— Tim Wray (@TimRWray) March 20, 2016

The mistake also brought back memories of Terry Lamb in 1992, who took a late field goal for the Bulldogs when down 12-10.

Believing the score was 10-10, he made it, before realising his mistake as the Bulldogs lost 12-11.

Inglis' inexplicable attempt with seconds left on the clock missed anyway, consigning the Rabbitohs to their 8-6 loss.

Now, we wait to hear his explanation.