Commodity and currency prices going up and down is real. This is how traders make money; stagnant markets are hard to make money on.
The stories behind them moving are likely staged or completely fabricated.
Is Yemen even organized enough, let alone able to afford/deploy a military drone? Even if it did, the USA sells more fighters etc. to Saudi than anywhere else. Were all these planes sleeping? The story is on its face nonsense.
Update: The WSJ is out with an update hinting at just how much the price of oil is set to soar when trading reopens late on Sunday after the Saudi Houthi false-flag drone attack on the largest Saudi oil processing plant: