You have a beer bottle. There is a small pen cap inside the bottle. You must get the pen cap out of the bottle without touching or breaking the bottle...

There are three switches outside a closed room. There are three lamps inside the room. You can flip the switches as much as you want while the door is closed, but then you must enter just once and determine which switch is connected to which
lamp. How can you do it?

There is a number which, when spelled, has no repeated letters and has each of the five vowels once. What is the number?

What is the product of all the numbers on a phone?