I suggest "ENGABUGING!" or, if you're a Navy/Police. "STOP RIGHT THERE CRIMINAL SCUM!"
Also, my usual pick up line for pirating ships is:
"Hey there. I'm here from Dead-end Insurance. Would you like to purchase some life insurance? Only 2 million."
If he refuses then...
"You sure? You never know when something BAD might happen to you."
Then if he still refuses.
"Oh dear...I think I might have 'accidentally' activated ship defenses. Do run away."
*Le pew*