Two very fun coffee RFCs:

1) Hyper Text Coffee Pot Control Protocol (HTCPCP/1.0) https://www.ietf.org/rfc/rfc2324.txt

2) Definitions of Managed Objects for Drip-Type Heated Beverage Hardware Devices using SMIv2 https://tools.ietf.org/html/rfc2325

--- Especially amusing as I was thinking of adding SNMP support to my coffee machine, so the humorous RFC above might actually be relevent.