What are the next two letters in the following series and why?
W A T N T L I T F S _ _

*Hint: Check Puzzle Title

What is the next number?

77, 49, 36, 18 ?

The barber of Town shaves all men living in the town. No man living in the town is allowed to shave himself. The barber lives in that town. Who then shaves the barber of the town?

The following sentence is false. The preceding sentence is true.
Are these two sentences true or false?

I am first found in caves, now prolific online; I am a depiction, a drawing, a symbol, or sign. I will convey whichever mood you could wish; or for that matter, a fist, flask, or fish. What am I?

There is something which you can be arrested for attempting but not for successfully completing.

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

Which tank will fill first?

You see me once in June, twice in November, and not at all in May. What am I?

I know a nine-letter word having only one vowel.
Do you ?