Riddle

I'm reading a book on anti-gravity.

Choose an answer

A.It has no ending
B.It floats off the shelf
C.It's too heavy to lift
D.It's impossible to put down!
Hint: It's a 5-word phrase with 22 letters, starting with "I".

Answer

It's impossible to put down!

Why this is the answer

This puns on 'put down,' meaning both stopping reading a book and gravity holding objects down.

This riddle is filed under Funny Riddles and rated Easy.

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