Which John?

This is so inside so as to be un-understandable to virtually everyone but this guy:

I don't have a goofy pic of the OTHER John, so this will have to do. Heard you (which John? or both Johns?) ran into my bro in law and sister in law at Homecoming and caught up. Hope you had a great time--my 20th was a memorable blast.

By the way, the above pic comes courtesy of the Shamrock Mafia, all of whom are busy scanning incriminating and embarassing information to disseminate via the interwebs...