I'm involved in the music program at my church as part of the worship team. There's one song that I have to work hard not to giggle during, as our lyric sheets refer to God as the:
"Defender of the week" (instead of "Defender of the weak")
I'm lucky my team has a sense of humor, as they laughed when I asked who it was next week.
And on a less-funny note, I have a book (on writing of all things), compiled by a bunch of authors. One chapter is so riddled with grammatical errors that it's actually difficult to understand what the guy is trying to say. Luckily it was the least useful chapter in the book (or maybe I just think that because I can't get the right meaning out of it...).