Korean superstitions

1. 미역국 You might not want to eat 미역국(seaweed soup?)right before some important test, interview or exam, whatever. Since the seaweed is very slippery, it's considered unlucky.

In Korean, they use 붙다 to stick for an exam.

 ex) 시험에 붙다/합격하다

So, slippery things are not good for sticking to something.