What is so fragile that saying its name breaks it?

One day, John and his friends were playing around. Jacob hit something with a Pin and it popped. John's dad came into the room that very moment, but he wasn't mad. In fact, he was smiling. What did Jacob hit?

What do you think with the below Picture ?

An equation has been laid down using a few matchsticks. However, as you can see, the equation is not correct. Can you correct the equation if you are allowed to add or remove 5 matchsticks?

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

How do you go from 98 to 720 using just one letter?

There is something which is always coming but never arrives?

Prove that the below maths equation is true.

8 + 8 = 91

If you read clockwise, you can form a word by inserting three missing letters in the picture given below. Can you do it?

What is the next number in this matchsticks series riddle?