Denis (read bio pls)

“Mr. Parker, a businessman, is leaving on a trip and stops by his office on the way to the airport, around midnight. The night watchman, Paul stops him and says, “Mr. Parker, please don’t take that flight. I had a dream last night, a little after midnight,  that your plane would crash and everyone would die!” The business man cancels his trip and sure enough, the plane crashes, no survivors. Mr. Parker gives Paul a $20,000 reward for saving his life, then fires him. Why?”
― Puzzleland, 30 Interactive Brainteasers to Warm up your Brain

“A school teacher asks his pupils to put in a large box certain objects only. Apples and balls are allowed, but pencils and flowers aren’t. What determines whether an item can enter?”
― Puzzleland, 30 Interactive Brainteasers to Warm up your Brain

“Jessica has two hourglasses, an 11 minute and a 13 minute hourglass. She wants to time accurately 15 minutes. How can she do that?”
― Puzzleland, 30 Interactive Brainteasers to Warm up your Brain

“Switch on one of the light bulbs for a long enough period of time for it to get hot. Then switch it off. Switch on the second switch and immediately go to the room with the bulbs. There will be a light bulb that is hot and off (the first switch you turned on), a light bulb that is cold and on (the second switch you turned on),and a light bulb that is cold and off (the third switch).”
― Puzzleland, 30 Interactive Brainteasers to Warm up your Brain