How often do good journals publish amusing little corollaries? I've had a little corollary sitting around a while now. It is closely related to a major theorem in my area.  Its statement is easy to understand (and rather interesting/amusing on the surface of it) and it's proof can be written in a couple of paragraphs.  

I thought it had potential to be the beginnings of a nice paper, but I've struggled to find good "related stuff" to add to it.  

Should I just submit this little 1.5 page paper, or would I be wasting everyone's time?  Do any good journals regularly accept these kinds of "notes"?
If other people share your enthusiasm for the observation and the proof, then it's of interest to journals. I would just contact one of the editors and see what they suggest. It's their job to be in charge of these questions.