A sundial has the fewest moving parts of any timepiece. Which has the most?

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?

It's a 7-letter word.
If we remove 1 letter from it, it remains the same.
If we remove 2 letters from it, it remains the same.
If we remove 3 letters from it, it remains the same.
If we remove all the letters from it, still it remains the same.
What is it?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

How can you leave a room with two legs and return with six legs?

I have feet, but no legs. Which animal Am I?

A man is found dead with a knife in his back When the investigation is done. A chair lays beside him and the forensic team finds moisture around the body.

If he committed suicide, how did he do it?

I have eight fingers and two thumbs but I do not live. What Am I?

You walk into a creepy house by yourself. There is no electricity, plumbing, or ventilation. Inside you notice 3 doors with numbers on them. Once you open the doors you will die a particular way. Door No.1 You’ll be eaten by a lion who is hungry. Door No.2 You’ll be stabbed to death. Door No.3 There is an electric chair waiting for you. Which door do you pick?

Can you find out the remainder when 3^300 is divided by 5?