It's a similie, because it compares something to something else.
"My cat stood as still as a statue" means that it was like (or similar to) a statue.
You could have a metaphor that use the same imagery. So
"The instant it saw the mouse, my cat became a statue." This does not imply that the cat actually transformed into a statue, but it uses the metaphor of an unmoving thing to put an image into your head.
Oh, dude, that's a tough one. So, like, technically speaking, it's a simile because it's comparing Sam to a statue using "as still as." But, like, who really cares, right? I mean, it's not like Sam actually turned into a statue or anything. So, yeah, it's a simile, but like, whatever, you know?
As still as a statue.
A metaphor
A metaphor, a simile uses the words like or as.
that man
simile
simile
simile
simile and METAPHOR AND PERSONIFICATION AND CHEESE
simile
simile
Its a metaphor