In episode 4 of High School Fleet, the girls are running out of toilet paper and decide to go buy some but they don't have enough money so they ask the crew member to donate some of their money. Some girls don't have money, one of them wants to use a check and one other even wants to donate a Zimbabwean currency. But when Mina (she's German) says she only has Euros, all the other girls start laughing. (around 5:30 mark)
Why does everyone laugh at Mina?