Space

Janey the Packrat was always running out of space on her work computer.
After buying a bigger hard drive and archiving files to disks, she still kept running out of free space.
“Try compressing things,” said the office geek.
So, she did. She ran the Compression routine and it said she had plenty of free space.
“What if I compress the compressed stuff?” she asked herself.
Sure enough, she had even more free space.
Ten hours later, as she ran the compression routine for the fifteenth time, her computer imploded, collapsing into a black hole and slowly devouring the earth.