Oh, yes, the joys of family tree tracing - where I found out that my paternal grandmother was her own first cousin on both sides, even though it didn't start looking -off- until her parents..... or that quite a few people on my dad's side are related on both his mom and dad's side [still say I'm related to anyone from PA at this point]...
I've even somehow got someone or several someones related to me on both my mom and dad's sides of the family, which is really weird, but if my cross comparisons are accurate.....