riddle

I'm subscribed to a newsletter that gives us a riddle in each issue, but usually the riddles are too weird to solve, but I managed to solve this one, and I think it's really not bad. Here you go:

What do the following things have in common?

1) Car brakes
2) Mouse
3) Door hinge
4) Swing
5) Old Gate

The answer's further below.



















They squeak! :-D

Okay, here's the "official" answer:
They all make the sound squeak:
car brakes when they are old;
a mouse's sound;
a door hinge when it needs some lubricant;
a swing when in motion;
an old gate being opened and closed.