Slower Than Molasses in January

One of the best things about living with a four-year-old and a two-year-old is getting to listen to their acquisition of language--hearing them try out new words in the wrong way, and then work around to the right way; listening to them string words together in way that make no sense and then, later, do; and, especially, listening to them try out slang.  Joe's latest fixation in this last category is "slower than molasses in January."  His seat belt's giving him trouble?  Must be because it's slower than molasses in January.  His concrete mixer truck pieces aren't coming together just so?  Well they're slower than molasses in January.  Joe hasn't quite got the context piece of this crazy fun expression worked out?  Probably won't take as long as molasses in January before he's got it.