Water you waiting for

Overnight guest, ready to shower:
"Sean, you're hot water takes a LONG time to heat up. I've been running it for like 5 minutes..."

Sean, not looking up from his computer:
"Oh, the [H] and [C] knobs are reversed."

Guest:
"Of course they are." (Wanders back into the bathroom.)

- - -

We don't have water today (what the heck?) but I'm happy to say I finally spent the quite literally 30 seconds it takes to switch the knobs to their correct spigots.