I am a twin and If you are a twin or maybe you know some twins... the funny experiencies and some other awful ones happens during each other life´s.
1. ID exhange:
If twins exhange their ID, who will know that? for basic things obviously, but the identity could change in seconds without matters haha.
2. Feeling inside your twin´s heart
It is true, a twin can feel what the other ones feels in some specific situations, specially the dangerous. It had just happened a very few times but it is real. Doctors and scientifics can say a lot of brain theories, but the truth is a soul connection and that´s it.
3. Greetings coming from strangers
If you are a twin, I just recommend you to talk to everyone even if you dont know it, maybe they know your brother/sister, and make them laugh after you confuse them.
4. Couples
it is a controversial topic, but twins can talk to the other´s couple and the identity can be easily unoticed, so be cautious.
5. Friendship
Nobody can understand you better than your twin, maybe you are completely different, but twins can afford can face similar problems in personality, bad habits, even the same diseases. Also the empathy is extremely higher because you are seeing happy or sad someone identical to you.
Enjoy!