Although self-adhesive stamps feel more like festive stickers than real stamps, I do not mourn the passing of the stamps that had to be moistened by tongue. The glue was rarely reliable.

MAD Magazine once published a series of fumetti made of postage stamps. One had a stamp of George VI with his head facing left, and an otherwise-identical stamp with his head facing right. The series was left-right-left-right-left, and on the last one was a word balloon in which he was saying, "Jolly good tennis match!"