Exploding toilet

I am in receipt of a message from the Town of West Hartford Metropolitan District Commission entitled
Sanitary Sewer Cleaning and TV Inspection

That's right, TV Inspection.
I presume TV is an acronym for something but they never say.
They do go on to recommend that I keep my toilet seat down
"...in the event that a pressure build up causes a spray."

First things first:
Sanitary Sewer?!
I've seen the inner workings of those things and the last adjective I'd throw at them would be "sanitary". Why, my "sanitary sewer" backed up into my basement a few years ago and the whole place was so fresh and clean that I needed to call in people with a van full of powerful equipment to put on environment suits and vacuum away all the springtime fluids and odors. And, let's face it, some springtime solids also.
This is a direct quote from the guys looking INTO my gaping sewer outlet to the street. This was said with a totally straight and flat delivery.
"There are some awful things in there."
These guys do this all day and night for a living for years on end but they saw fit to comment on my unique contribution to the industry. Wow.

Next up:
TV Inspection?!
It's got to stand for something and I apparently am expected to know what it means.
Turd Valve? Toilet Valet? I hope mine is extra nice so it passes inspection.
Maybe they actually mean television. I am prepared to have my television inspected by the state if that's what it will take to defeat terrorism.

Lastly:
Keep my toilet seat down in the event of a SPRAY?!
A spray of what? I bet it's lots of fun, whatever it is!
What is keeping my toilet seat down going to prevent if there should be a pressurized geyser of liquid sewage strong enough to reach from the street all the way into my house and up the pipe? I'm not sure I buy the whole toilet seat defense maneuver in much the same way that I didn't believe that duct tape and plastic was going to keep the atom bombs out of my house in 2001.