All reasonable theories...as good as any I can come up with. There is the possibility that with no vac valve that on cool down, with the pf and screen removed, and some monofilament fishing line got spagetti sucked up by the group and into the boiler and with enough heat and time it self assembled into something resembling a knitted dead mouse. Of course it could have entered through the steam wand as well...I think I'll go with the coprolite theory...seems more plausible.

I have been wondering if it could have been left in there by a careless technician..or even a tech sufficiently aggravated be some sufficiently aggravating customer did it on purpose. It smells like Aqua Velva.

Anvan, you're cracking me up The funniest thing I have read on this forum so far.
Doug, what a brilliant video, I'm glad you shared it. The sucked-in theory is likeable in a 60's UFO abducted-by-aliens way. Poor unsuspecting fishing line, it didn't know what was waiting for it...
May you all have a great Saturday, or what's left of it for you people down under, this thread enlightened mine. Coffee tastes better now