Denis (read bio pls)

“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

“Answer: Only objects with a repeated letter are allowed: pp in apple and ll in ball.”
― Puzzleland, 30 Interactive Brainteasers to Warm up your Brain

“What fact do these words represent? CAT 8 MCE MCE MCE”
― Puzzleland, 30 Interactive Brainteasers to Warm up your Brain

“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