It's a storm sewer. If it fills with gas, I pity the person who lights a match within 10 yards of it.
6 seconds sound clip from the Christmas Vacation (1989) movie soundboard.
You can hear this line at 00:58:28 in the Blu-ray version of the movie.
Quote context
[...]
- And an asshole in his bathrobe emptying a chemical toilet into my sewer.
- Yeah.
- Have you checked our shitters, honey?
- Clark, please. He doesn't know any better.
- He oughta know it's illegal.
- I have this terrible suspicion that Cathrine and Eddie don't have any presents for their kids.
- Rocky said something about Eddie telling him Santa wasn't coming this year.
- Yeah. Ruby Sue said something like that last night.
[...]