Source: King of the Qwerty Jocks.
18 seems low. I thought my excellent balance would guarantee at least twenty. Alas, I'm 5'8", all torso. I resemble a t-rex only in proportional arm length.
Try it yourself.
Current Reading
The Romantic Manifesto: A Philosophy of Literature
by Ayn Rand

Current Watching
Grizzly Man

The Romantic Manifesto: A Philosophy of Literature
by Ayn Rand

Current Watching
Grizzly Man

p.s. Jenine called me this morning