When Bob and Bill came to the house, the Professor was still asleep. The window was open, because it was so hot. The two men could see the Professor and his hat.
Bob climbed in through the window. On the table there were lots of pieces of paper. Bob started to read them, but Bill told him to hurry up.
Take his hat! said Bill. Quickly, before he wakes up. Bob lifted the hat from Professor Brainy's head. There was a funny noise. What's that? said Bill.
Sh! said Bob. You'll wake him up. But the Professor did not wake up. His head was lying on the sandwich. The noise was coming from the hat. The computer inside was going Ping! Ping! Eeeee.....
Stop the noise, said Bill.
Sh! said Bob. I can't. He pushed some of the Professor's papers into the hat to stop the noise. The computer went Ping! Ping! Eeeee..... even louder. Bob put the hat on his head to climb out of the window. Then the noise stopped. Bill and Bob ran quickly behind a tree.