[Hal is smoking a cigar and using a vacuum cleaner to suck up the smoke]
Lois: [o.s.] Hal?
[Hal panics]
Lois: [enters] Are you smoking again?
Hal: No! I am cleaning. Do you smell smoke?
Lois: No, but I...
Hal: No, Lois, if I wanted to smoke a cigar I wouldn't be sneaking around like a scared little schoolboy. I would do it out in the open like a man. [the vacuum engine splutters and smokes]
Lois: That was our third shop vac. That is our last shop vac.