I believe it is illegal to install OS X on hardware that is not licensed by Apple, though I am not sure where I heard that. Maybe it's in the OS EULA? Who reads those anyway.

Maybe someone can correct me? The above may not be right.

Its right. The EULA forbids use of the software on any non-apple hardware.

Yeop, also my little idea to force a PC motherboard to use a EFI system would be illegal as well unless you use the same ROM dump from a mac you own and cannot use both systems at once. I remember this fact from the old 68k mac emulation days.

In the US, its illegal to spit  on the ground in some states.

Legality is subject to reality in some places. A quick search found these gems


In Texas, it's against the law for anyone to have a pair of pliers in his or her possession.

In Philadelphia, you can't put pretzels in bags based on an Act of 1760.

Alaska law says that you can't look at a moose from an airplane.

In Corpus Christie, Texas, it is illegal to raise alligators in your home.

In Miami, it is forbidden to imitate an animal.

It is against the law to mispronounce the name of the State of Arkansas in that State.

In Illinois, the law is that a car must be driven with the steering wheel.

In Florida alone theres tons of screwed up laws.

    *  Women may be fined for falling asleep under a hair dryer, as can the salon owner.
    * A special law prohibits unmarried women from parachuting on Sunday or she shall risk arrest, fine, and/or jailing.
    * If an elephant is left tied to a parking meter, the parking fee has to be paid just as it would for a vehicle.
    * It is illegal to sing in a public place while attired in a swimsuit.
    * Men may not be seen publicly in any kind of strapless gown.
    * Having sexual relations with a porcupine is illegal.
    * It is illegal to skateboard without a license.
    * When having sex, only the missionary position is legal.

The major one that doesn't make sense.

"When two trains are about to pass they must stop until the other train passes."

It's really worded like that in the books.

Heres a few in Jacksonviolle Florida.

* It's illegal to eat chicken wings before 10:00am
* It's illegal to call the firefighters on Sunday.
* It's illegal to have a room mate that is a different sex then you.
* It is considered an offense to shower naked.

There is a churchyard between England and Wales, where it is 100% perfectly legal to shoot and/or kill and annoying welshman with a crossbow on a thursday. Or it may have been a longbow.
I defy anyone to find a funnier law than that.