John 21 is quite peculiar. It doesn't fit into any of the tidy resurrection appearances. Peter has been fishing all night on the Sea of Galilee with Thomas, Nathanael, James and John, as well as two other unnamed disciples (I think the anonymous, "beloved disciple," is one of these).
After a night without anything, someone appears on the shore and tells them to throw their net on the other side of the boat. Suddenly, they have more fish than they can haul. Then they all realized it was Jesus. He cooks for them and serves them.