Jason Giambi’s mustache is for real
Do some hunting around the Internet, and everyone seems to agree that The Mustache made it’s appearence around the middle of May. As of this posting, Giambi has played just about as many games with it, as he has without it.
If you doubt its power, look at this incredible breakdown of his numbers with and without The Mustache:

G R H HR RBI BB BA OBP SLG OPS
—————————————————————————
34 16 19 7 20 23 .181 .341 . 438 .779

G R H HR RBI BB BA OBP SLG OPS
—————————————————————————
35 25 40 10 25 16 .348 .464 . 661 1.125