Oh boy, a fully automatic weapon

Who: Everybody in the medi-bay, if you think I'm going to go read a
previous post to find out, think again
Where: Think about it
BD Cerebrum took the rifle from Dr Keto, and glanced at the ammo
meter. "Damn, it's full. The bullets might explode if it's full when
I use it as a focus. Better get rid of them."
Cerebrum flipped the gun to full-auto, then held down on the trigger.
Three frantic seconds later, there was a click, and Cerebrum slung
the weapon over his shoulder. Everybody who was capable had flung
themselves to the floor, and were now glaring at Cerebrum as they got
up.
"That wasn't the proper way to empty a gun in a crowded environment,
was it?" BD Cerebrum wondered aloud, "Oh well, you learn something
new every day." Then he made a break for it.
Later, at docking bay 20
The meson cannon was complete, it was easy to construct, being made
mostly out of Lego. The Cerebrums were in the shuttle bay control
center, which had been jury-rigged as the meson cannon control center.
"Now, call up the Red Dwarf," BD Cerebrum said.
"Aye, aye," Cerebrum-4 responded, then punched the big red button
marked, 'Call up Red Dwarf.'
"Attention, whoever is in charge of the Red Dwarf, this is Dr Patrick
Cerebrum, psyhciatry. I have a weapon of immense power, and unless
you donate five hundred million dollarpounds to the psychiatric
departments budget, I will destroy your ship with it. Cerebrum-6,
fire a warning shot across their bow."
Six pushed a button, the shuttle bay doors opened and the meson
cannon hummed as it charged up. There was a tremendous blast, and a
huge beam of energy shot out of the meson cannon, destroyed a line of
parked starbugs, and blew down part of the wall. There was an oops
from the control room, then the meson cannon pivoted ninety degrees,
aimed and fired. The beam shot out and knocked off part of the Red
Dwarf.
"You see that?" BD Cerebrum said, "Now, hear me well, Red Dwarf, pay
me now, or prepare for the psych-treatment from hell!
Muhahahahahahahahah!!!!! And aim that damn cannon at a more vital
part of Red Dwarf."