The genitive case is the least frequently used of the four cases, but that's no excuse to slack off. Learn how genitive nouns differ from pronoun possessors and fulfil your life's purpose of learning all the Icelandic!
Mine, my own, my precious! Gollum knew the importance of drawing clear boundaries around what's yours, and you should, too! Learn to use the words minn and þinn so you can tell the cops it's not your illegal substance, it's THEIRS!
Do you sometimes say that you have your friends when you mean you're with them, and that you're with a hostage when you mean you have him? Clarify your understanding of "með" so the cops can understand you more clearly!