Depends. Usually happy.

WYR listen to a friend vent after you've had a not-so-great day or vent yourself?

Vent myself, except with strangers I [ALMOST]* never do and end up listening to "friends" venting.

* On my very subjective reckoning, of course!
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WYR read tables of C14 levels related to buildup to match with Bible chronology or a discussion of angels dancing with stars to match Joshua X:12?

read the table of C14 levels one I guess. I don't know what either of the things are but oh well.

WYR be able to fly or teleport?

Teleport.

WYR be slightly underdressed or overdressed for a birthday party?

underdressed.

WYR be forced to listen to Justin Bieber or watch High School Musical?

O_O High School Musical.

WYR have a really horrible cough or a super-stuffed-up nose?

A really horrible cough. ... I could at least have some fun and make Gollum noises. 😕

WYR dress like a knight of Gondor or an Elf?

(Hahaha!)

Like an Elf: I love their wardrobe!

WYR buy a bookcase or simply make your own?

Buy one!

WYR paint dots or stars on your wall?

dots

WYR put pictures all over your house walls or paint them all beige?

Pictures

WYR have a backpack or a messenger bag?

Sack. What I have. By now nearly only macramé added by me, not much left of original sack except string and the part of it where the string was.

WYR learn a new language or learn a sport like archery, hunting, riding or fencing?

Oooh, good one. It would depend on the language and the sport. But I'd probably go with the language.

WYR celebrate a holiday a week early or a week late?

It really doesn't matter to me and I think I've done both. But I'll say early since that tends to happen more often.

WYR talk about the weather or politics?

Um... weather. Politics usually ends up being very controversial. 😕

WYR oversleep or sleep too little?