Some years ago I bought 100 TV aerial chimney brackets. They were all
malformed and if the side of the chimney was vertical the mast came out
on a slight tilt. I took them back and the man said I was 'a bleeding
perfectionist'. He changed them though.

Likewise my son-in-law had a house in which the downstairs lavatory
pedestal was faulty in that the base was rotated somewhat relative to
the top part. It looked odd. The seat was correct but the base (which
was eight-sided; well rectangular with bevelled corners) was at an angle.

Not the same thing at all, and I don't know why it comes to mind, but in
the 1970s my uncle had a flat roofed kitchen extension built. The
brickwork joined the existing building at each side. Somehow it rose one
course on its way round. The whole structure was skew-whiff. The back
window was on a distinct slope but the ceiling (I don't know how or why)
was perfectly level, so the bit of wall above the window was visibly
trapezoid.

Bill