A patient was diagnosed with some ailment. He was given five different tablets to take at night at an interval of 15 minutes.

How long will it take the patient to consume all the five tablets?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

What has 88 keys?

Which English verb becomes past tense just by rearranging the letters?

What goes up but never comes down?

The more it dries, the wetter it becomes. Can you tell what it is?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

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

A bus driver was heading down a street in Mexico. He went right past a stop sign without stopping, he turned left where there was a "no left turn" sign, and he went the wrong way on a one-way street. Then he went on the left side of the road past a cop car. Still - he didn't break any traffic laws. Why not?

Can anyone tell me a word in the English dictionary which has a silent 'z'?