ChallengeEdit
My challenge to all: Play all the way through to Sovngarde and kill Alduin (complete the main quest) without using any skills but Speech. You cannot use weapons or armor (clothing and fists, use Khajiit), no spells (staffs and scrolls are okay), cannot craft potions or enchanted gear (Any clothing or potions you find are useable), cannot read skill books, and can never sneak or pick locks (It's okay to steal things in plain sight).
First, I recommend bringing a basket or 3 with you, second, get Clavicus Vile's mask as soon as you can (The dog can do all the grunt work), and get yourself a strong follower. Third, increase your Speech as much as you want using the usual bug. You can successfully walk past the bear in the prologue without sneaking, and you can hide around the corners for all of the other scripted fights without anybody noticing you. Sven is okay as a first follower. Health is more important than Stamina.
Hard Mode: Don't buy or sell anything, or do any Speech checks. Kill Alduin without any skill gains whatsoever. This means you can only use the things you steal or find out in the open. Make those potions count. [For example...]
Extra: Do the Dark Brotherhood assassinations. Yes, that means with your fists (and a follower), out in the open. Good luck with the final kill. (I believe you must do speech checks at some point, so no hard mode)