Subject: break your tongue:)

(In German)

Wenn Robben hinter Robben robben, robben Robben Robben nach!

Fischers Fritz fischt frische Fische, frische Fische fischt Fischers Fritz!
(edited)

The last one in Dutch:

Visser Frits vist frisse vissen, frisse vissen vist visser Frits.

here a lot of italian phrases

my favourite:

Se l'arcivescovo di costantinopoli si arcivescovocostantinopolizzasse vi arcivescovocostantinopolizzereste voi per arcivescovocostantinopolizzare lui?

(almost impossible)
(edited)

de koetsier poetst de postkoets met postkoetspoets

one in German:

Bürsten mit weißen Borsten bürsten besser als Bürsten mit schwarzen Borsten bürsten.


and one in turkish:

Bu yoğurdu sarmısaklasak da mı saklasak, sarmısaklamasak da mı saklasak?

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arnau jo creia que plou poc, però pel poc que plou, plou molt era:

plou poc però per mullar-se plou prou...

catalan:

setze jutges d'un jutjat mengen fetge d'un penjat, si el penjat es despengés no menjarien el fetge dels setze jutges

xDD

español:

tres tristes tigres comen trigo de un trigal.

pablito clavo un clavito. ¿Que clavito clavo pablito?

valenciano:

deu deu deu ( god ow me ten xD, word game)

catalan:

en cap cap cap que déu deu deu

Three sweet switched Swiss witches watch three washed Swiss witch Swatch watch switches. Which sweet switched Swiss witch watches which washed Swiss witch Swatch watch switch?

didnt know the full phrase xD

Hahaha, those were the same I thought. ;P

Chrząszcz brzmi w trzcinie w Strzebrzeszynie. :)

I'll keep it no further than: siema, if you don't mind?