SH: Are we going to [wxyz] tonight?
Me: I think we should.
SH: But that means I have to take a shower.
Me: Well yes.
SH: But I have to take another shower tomorrow [before he leaves on a business trip].
SH: That's just inefficient to take a shower at night and again the next morning!
Me: Since when have you been concerned with efficiency?
SH: It doesn't make sense.
Me: Fine. We don't have to [wxyz].