I read posts like these and said to myself, "well, I haven't had any foam disasters yet, and I probably won't." Yes, I talk to myself, but that's another story.
And of course, as if on cue, I went into my home office this morning where I am temporarily keeping my primary, and THAR SHE BLOWS! Nothing catastrophic, but the airlock looked like a 2 year old's face after finishing a chocolate sundae. Heeding your collective advice, I sanitized a thin hose, the stopper, a short piece of hard plastic tube and a glass jar, filled the jar halfway with the sanitizer solution, and ran the tube into the jar.
It's bubbling nicely, and the mess is contained. Now, it makes those science lab bubbling sounds. I think I need to find a long white coat and one of those machines that shoots sparks. Booo hoo ha ha haaaa (text version of my evil laugh).