Which of the below owl is odd one out?

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

4 fathers, 2 grand-fathers and 4 sons went to watch the movie.What is the minimum number of tickets they need to buy ?

Your mother’s brother’s only brother-in-law is asleep on your couch. Who is asleep on your couch?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

Two in a corner, one in a room, zero in a house, but one in a shelter. What am I?

Buy me, smell me or deliver me, I do not change.

Who am I?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

What do you think with the below Picture ?

Three men in a cafe order a meal the total cost of which is $15. They each contribute $5. The waiter takes the money to the chef who recognises the three as friends and asks the waiter to return $5 to the men.

The waiter is not only poor at mathematics but dishonest and instead of going to the trouble of splitting the $5 between the three he simply gives them $1 each and pockets the remaining $2 for himself.

Now, each of the men effectively paid $4, the total paid is therefore $12. Add the $2 in the waiters pocket and this comes to $14. Where has the other $1 gone from the original $15?