What does below rebus means ?

Can you count the number of lines in the below picture?

Once while in his court, King Akbar asked Birbal to write something on a wall that makes one sad when read in good times and makes one happy when read in sad times.

He took only a few moment and wrote something that fit the requirements. What did he write?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

After undergoing a successful eye operation, A blind girl has just boarded a train to her home. The doctor asked her to open the bandages after 3 hours. On her train journey, she opened the bandages and within a fraction of the time she commits suicide by jumping off the train.

Though her operation was successful, Why did she commit suicide?

An infinite number of mathematicians are standing behind a bar. The first asks the barman for half a pint of beer, the second for a quarter pint, the third an eighth, and so on. How many pints of beer will the barman need to fulfill all mathematicians' wishes?

John is the son of Jacob.
So,
Jacob is the_____of John's father?

I have Rs.50 and I spend it in the way as below.

Why is the Hole below a Lock?