In Wales, when it's raining hard, we say 'Mae'n bwrw hen wragedd â ffyn', which translates to 'It's raining old ladies with sticks'.
In Afrikaans, if you're going to give someone what-for, you tell them 'Ek sal jou wys waar Dawid die wortels begrawe het!' which translates to 'I'll show you where David buried the carrots!'
What are some fun idioms from your language?
@WelshPixie
In german, when you figured something out, you can say "Das ist des Pudels Kern", which means "that's the Poodle's core"
@hinterwaeldler @Mopsitravels @WelshPixie most probably (the poodle in Faust turns out to be Mephistoteles. So that poodle's core is the devil)