I bought some grapes at the market today, and served them with our lunch. As I was plucking them off one by one, I encountered what I thought was a dog hair. (I have a yellow lab. His hair gets everywhere.) Anyway, as I picked it off, I realized it was a strand of spider silk. I didn't think too much of it unitl I had pulled a few more grapes from the stem, revealing this egg sac.
I pulled all the rest of the grapes off and put the stem with the spider eggs outside.