Do read "When are you going to sue your customers?", it's a very good read.
I can think about one company that sues its customers, Apple :-)
"CChheecckk yyoouurr dduupplleexx sswwiittcchh.." -- Tech Support Slogan
"Breakthrough: It finally booted on the first try." -- Tech Support Slogan
"The steady state of disks is full." -- Ken Thompson