say what?

This week in my Czech lessons we were working on pronunciation and the teacher had us practice some Czech tongue twisters. These phrases of consonant clusters don't even have a vowel! Forget saying them five times fast, I'm lucky to stumble through them once.

Strc prst skrz krk (Stick your finger in your throat)

Vlk zmrzl, prst zvlhl (The wolf became frozen and the finger got wet)