Answer:
What comes in many varieties and can't be seen or touched, but it often makes you move?
What has many keys but cannot open a single lock or door?
You can carry it everywhere you go, and it does not get heavy. What is it?
Whipping one of these out in the wrong setting is said to be terrible luck.
If you need a night out, call one of these over to take the little ones off your hands for a while.
A little house full of meat, no door to go in and eat.