In the last few years I've presided over brisses of twins around 10 times (with a few additional situations where one of the twins was a girl - so it was only one bris).
In two cases (two separate sets of twins) the parents were living in the US but had relatively recently moved here from France - can't get into all the reasons why, though I'm sure that one reason is obvious to everyone.
What's up with French Jews having twins? :)
It is most fun for me for two reasons as well. My last name is a European word which means "ticket" - and it is so French of a word that these lovely families feel an additional connection with me owing to my French origins, beyond our being Jewish. (FTR, I know of no Billets from France, and I speak as much French as Huckleberry Finn)
The second reason is harder to explain, but it is 100% true. While I speak a decent Hebrew and with an undistinctly American accent (living in Israel for a year as a kid helped me fashion my own version of an Israeli accent - though my vocabulary limitations are a dead giveaway), every time I'm in Israel and find myself in Jerusalem, whether in conversation with a vendor or when either asking for or giving directions to someone, I'm inevitably asked "Ata Tzorfati?" (Are you French?) Maybe it's a complexion thing, or maybe it's a style of Hebrew-speak, but it has happened so many times I don't even wonder what it's all about anymore.
Anyway - point is, there is a connection beyond words that exists between me and French Jewry. And I am always honored to be the mohel for the twins - and even enjoy the occasional single bris that life brings my way.