This is a VERY fun activity which I saw Alina Filipescu demonstrate at NTPRS this past summer. It is a great 5-10 minute activity which is a lot like Hot Potato, and it is definitely full of comprehensible (albeit fast) repetitions. My students LOVE this game and the fact that I the teacher will play the final round against them. Here is a link to a blog post which Alina has written up about Pancho Cumacho (there is also a video of the game).
NOTE - for this game, even though I am using Latin words, I still keep the name Pancho Cumacho purely for the phonetics. I could not find a Latin name which would have the same effect.
Thanks, Alina for showing us this game!