What is both possible and impossible at the same time?

The below given figure comprises of a pattern through which you can determine the missing letter. Can you push your mind to find the pattern and add the missing letter?

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

In a jungle where there are no street lights or any other artificial source of lights, I notice a black snake crossing the road.
How did I get sight of the snake?

How many letters are in the alphabet?

Can you divide the below-given shape into four equal and identical pieces?

Dwayne Johnson was running away with the loot from a heist in his car along with Vin Diesel. One tire was punctured and he dropped down to replace it. While changing the wheel, he dropped the four nuts that were holding the wheel and they fell into a drain. Vin Diesel gave him an idea using which they were able to drive till the rendezvous point.

What was the idea ?

During which month do people sleep the least?

What does this say?

XLR8

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