Golf fans were shocked by Thomas Pieters' antics after poor second round

BMW PGA Championship - Day One

It has undoubtedly been Rory McIlroy's day at the BMW PGA Championship.

The Northern Irishman hit a seven-under 65, including four birdies in a row, to seize control in the second round.

The 29-year-old believed this was the best golf he'd played all year in spite of a difficult start.

"On the first three holes I hit it to six to eight feet and none of them went in and I thought 'Here we go,"' said McIlroy, via the BBC.

"But I played great after that. It was one of the best rounds of golf I've played this year, ball-striking-wise.

"I had everything sort of firing today and it was nice to take advantage of the opportunities I gave myself. There's a lot of guys still to go out but hopefully I keep the lead and will be in the final group tomorrow. It will be nice to go out and feel that."

Such is the nature of the game, however, that for every golfer that has had a splendid day, there is another who might as well pack his bags and head home from Wentworth.

Spare a thought for Thomas Pieters, who endured an incredibly frustrating round two and was virtually nowhere to be seen in the standings.

He lost it 

His +1 round left him going in at +4 over par and it eventually all got too much for him after one shot from the rough, culminating in the Belgian snapping his club in half over the back of his neck.

Take a look at the bizarre incident below:

As the commentator said, it was rather "obvious what he thought of that".

This is far from the first time Pieters has lost his cool out on the course. No - to make his fit of temper all the more peculiar, he's actually done it before, and still at the grand old age of 26 hasn't realised it's not a particularly good idea:

Golf fans react 

There was more positive news for Englishman Sam Horsfield, 21, who was attempting to stay hot on the heels of McIlroy, while Dean Burmester, Robert Rock, Alexander Norén, Kiradech Aphibarnrat and Nino Bertasio were also on seven under.

Yet, amidst all that, it's Pieters' antics that will certainly get golf fans talking.

Pieters' behaviour - funny or poor sportsmanship? Let us know in the comments. 

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