Riddle:
Charles called his wife to tell him that he would be home by 7:00. But when he arrived home three minutes past 7:00, his wife was furious! Why was she so mad?
Answer: Charles' wife expected him to arrive by 7:00PM, but he arrived at 7:03AM the next morning. Oh, the classic "I forgot about ante meridiem and post meridiem".
Riddle:
Ally and Gwen were told to do house chores on a rainy day. Ally chose to hang the laundry outside to dry, while Gwen vacuum-cleaned the bedrooms. Who is more stupid?
Answer: Ally is more stupid because it was raining all day, and there wouldn't be any need to hang laundry outside.
Riddle:
Oliver and Brittany are siblings. They were born in the winter and summer. If Brittany was not born in the winter, then who was born in the summer?
Answer: If Brittany was not born in the winter, then she was born in the summer. Therefore, it's Brittany.
Riddle:
There are 10 fish in my fish tank. Suddenly, two of them drown, three of them swim away, and four of them die. How many fish are left in the tank?
Answer: There are still 10 fish left. For one thing, fish can't drown. Plus, none of the fish could have swam away because they're still in the tank.