If X is less than Y, then X is not equal to Y. If X is not equal to Y, then Y minus X is not equal to zero. So, if X is less than Y, then Y minus X is not equal to zero.

The sun will probably rise tomorrow; after all, it has risen every day of my life so far

If woodchucks could chuck wood, then they would. So woodchucks would be dangerous.

Lucy hates the snow, and it snows every year in Maine. So Lucy shouldn't move to Maine.

When I become a bird-watcher, pigs will fly. And when pigs fly, I will probably mistake them for birds. So, when I become a bird-watcher, I will probably mistake flying pigs for birds.