Three Americans are sitting inside their submarine when suddenly they see an unidentified sub on their radar. They try to radio the people inside but no one answers. So they decide the best way to figure out who it belongs to is to go out into the water and look for markings on the sub.
First guy goes out, comes back a few minutes later and says "I couldn't see any markings on it...no clue who it is."
Second guy goes out, comes back a few minutes later and says "yeah same here, no flags, marks, nothing."
Third guys goes out, comes back a minute later, laughing. First two guys are confused so they ask him what happened. He said,
"They're Romanians."
"How do you know that?" They ask him.
He says "I knocked and they opened."
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