Do it when it’s not blown up!

No time, the wall is already built.

Correct, the word ‘what’ has 4 letters in it, ‘yet’ has three, ‘sometimes’ has 9, ‘then’ has 4, ‘rarely’ has 6, and ‘never’ has 5.

Just one

They would get paid more for two haircuts than one

He is with the mother.

by math: (baby’s age) + 21 + 6 = 5 * (baby’s age + 6)
(baby’s age) + 27 = 30 + 5 * (baby’s age)
-3 = 4 * (baby’s age)
-3/4 = baby’s age
The baby will be born in 9 months.

You put pair a on and put pair b on top of pair a and perform 1 surgery. You then remove pair b and perform another surgery. Finally you take pair b and put it over pair a inside out and perform the final surgery.

He is a relief pitcher

Russian dolls

After Tom realized he was going to lose he finds that the only way to live is to replace his poison with something that isn’t poison at all and drink a poison of his own before the contest. In this way he drinks his own weaker poison then neutralizes it with Bob’s stronger poison. Last he drinks the non-poison he submitted to the contest.

Once Bob realizes that this is the only way Tom can save himself he figures out that he can save himself by either drinking a weaker poison before the contest so his neutralizes it in the contest or submit a non-poison to the contest as well. If he drinks a weaker poison before the contest both Tom and Bob will live and the King will realize that they are disobeying his orders which probably won’t turn out well. But by submitting a non-poison to the contest as well Tom will end up drinking the weaker poison before the contest and the two non-poisons in the contest and he will still die, and the King will be none the wiser (although he will not get what he wants being that both of the poisons actually aren’t poisons at all).