Went to check the oil on our forester, found coolant on the block.

 

Factory spring-sheet-metal clamp had broken in 2 directly opposite the tabs, it really wasn't very rusty so can't blame that.

 

Anyone ever see anything like that?

I've seen those rust in half, I've also seen holes rust in the steel pipe to the heater core. It has a T that goes off to the throttle body heater and they tend to rust right at that intersection.

Yeah, this wasn't rusty, it just cracked in half.

where was it?

Top hose at the block. Removed probably only once years ago when the dealer did the head gaskets under warranty (external oil leak, that is of course back).