This part of your house is designed only to let things out. However, it also lets in one very specific man.

What is the largest organ in the human body? You might also talk about milk or bread dough developing one of these if left out in the open for a while. If you're easily offended people might say you need to grow a thicker one of these.

There's a tailback on the road several miles long, The cars and the buses are all very stuck, In a sugary substance made of fruit that has spilled, From a crashed and upturned delivery truck

I'm not right when alone. Two of me makes twenty. A threesome makes it dirty. What am I?

To the child, it is both a trampoline And a hiding place for monsters.