Um......a bit er......dirty, but I would rather you see the funny side.

A sgt-major was giving a lesson to the privates, when to show his discipline, he suddenly exposed his dick.
He said: Sedia!
And the dick rose immediately.
Then he said: Senangdiri!
And his dick fell back into place.
Feeling immensely proud, he said again: Sedia!
And his dick rose again.
Just then, a gorgeous woman walked by......
He said: Senangdiri!
But there was no response.
The sgt-major tried again, but failed. And to the privates' shock, he started to masturbate. When they asked why he was doing so when he said he had lots of discipline........
He replied: I'm giving it dishonourable discharge.