How in thunderation could anyone anticipate a result like this?

When a turbine oil lubricating system is drained of one turbine oil and refilled with another turbine oil, as much as 10 to 15% of the previous oil can remain in the system due to clingage, low-spots, and piping dead-legs.

Non-standard products (abnormal or 'uglies'): many distribution operations are designed to cater for standard palletized products.

a comely woman