My Twitter bot @tinyspacepoo is one of a few bots that reply to @tiny_star_field, a bot which routinely tweets text resembling the night sky. My first working implementation was mutually recursive with another one of these other bots, causing them to create an infinite-ish back and forth. (I think maybe Twitter issued an http 429 rate limiting response after a while?) Even this relatively simple bot/bot interaction was unexpected and required filtering.