For a moment I thought our two lobby guards were involved in some heavy banter, but the slow part of my language brain woke up and I realized I wasn't paying attention to tone.

"You silly pig" and "it's locked" is just a difference in tone: so4jyu1 (傻猪) vs so2jyu6 (鎖??).

(where ?? is some Cantonese character I don't know where to look up right now)