Grief joys, joy grieves, on slender accident.
Try saying that 10 times fast. I could barely even write it! Grief joys, joy grieves? Ye gad. I have to concentrate super hard to keep from adding plural suffixes where there are none and vice versa.
Maybe this whole speech is just an on-stage warm-up for the First Player! He’s built his tongue twister into his speech so that he’s all ready to go before his big death scene. He’s just exercising his instrument with this thing. That’s it. I have figured it out. (Surely not.)