4. Tarzan and Jane
Final Score: 30/40
Odds of meeting: An orphaned boy raised by apes in a treacherous jungle is improbable; his coming across another human in that same jungle as a young man verges on the impossible.
Obstacles overcome: A great many dangers lurk in the jungle, and a great many obstacles stand in their way, but their greatest challenge is bringing their two very different worlds together.
Friendship: Tarzan and Jane are both curious, adventurous and kind. Almost immediately they discover that they have much in common, and become true friends.
Likeability as a couple: As their mutual attachment grows, so does their likeability.