THIS IS THE PROPERTY OF UNIT
No it isn't! The TARDIS belongs to me!
Sorry Doctor, I got carried away stamping things.
Jo? Why are you stamping 'This is the property of UNIT' on things?
Sergeant Benton told me to.
Are you sure he wasn't playing a joke on you?
Doctor? What's UNIT?
Why, Sarah, it's a top secret organisation. Why?
You should cover this up.
Yes, Martha, I probably should.