Hack the satellite! And if you didn't have the budget for it, at least the railways

At the end of August, a pair of hackers caused a meltdown on the Polish railways when they stopped twenty trains. At first, the media wrote about a sophisticated cyber-attack, until it turned out that the hackers had "only" hacked into the communication network. 

The radio-amateur guys (in their twenties) needed thirty dollars worth of equipment and simply issued the STOP instruction. So they weren't actually amateurs.