I have a vague memory about a security talk where they used TXT records to deliver a payload to a machine and they had to write such code that the rows returned in the TXT records could be run in any order because the order the TXT records are returned is not deterministic.
I couldn't find the talk, but I found this nice article: https://unit42.paloaltonetworks.com/dns-tunneling-how-dns-ca...