The Attack of the Aqua Apes and Nightmare in 3-D - R L Stine

Do you believe in ghosts? Don't say no until you take a walk down Fear Street. Past the woods -- where no birds sing. Past the lake -- where something lurks beneath the water. Past the cemetery -- where everyone is dying to meet you.
When Scott and Glen decide to use water from Fear Street Lake to grow their Aqua Ape, who knew that the tiny little creature would keep growing...and growing...and growing. Will Scott and Glen be able to contain their destructive new pet before it's too late? Find out in The Attack of the Aqua Apes!
In Nightmare in 3-D, Wes Parker decides to buy a cool 3-D poster that caught his eye at Sal's Five-and-Ten shop. He finally is able to see the thing inside the poster -- and the thing sees Wes, too. Now it wants out. And it wants Wes....