There are three kinds of lies: lies, damned lies and statistics. From the autobiography of Mark Twain, although he appears to have appropriated it from another source.
For more information, see
http://www.york.ac.uk/depts/maths/histstat/lies.htm (as of 1982).
Statistics can often be used to show things that are not true. One must carefully look at any statistical claim (and assumptions).
Common saying:
Figures don't lie. Liars figure.