Okay, exploding is an overstatement, but leaking badly, spilling water all over the utility closet. So we turned off the water -- which left me with dye eating into my head. Okay, not eating into my head yet, but it was heading that direction. Luckily, this is a condo, with a laundry room two doors down, and a big utility sink. So I ended up finishing washing my hair in the sink -- and I was grateful that it was so early, since there was no one to walk in on me in my bathrobe.
A plumber's been called, and I have about an hour to take all the stuff off the utility shelf (so beautifully organized not so long ago), move the utility shelf, oh, and get dressed.
All in all, nothing I can't handle, but nothing I particularly wanted to handle either. Sleeping would have been better.