My cat Ana started throwing up two days ago.  Yesterday, I wasn't home much
of the day, but when I came home, she seemed fine.  Soon after I gave her
her evening dose of medicine, she threw up twice, clear liquid.  This
morning, there was more liquid vomit and she seemed lethargic.  Off to the
vet.
Turns out she swallowed a piece of plastic, not sure what it went to yet,
I'll see it tomorrow when I pick her up.  It was in her intestine, but did
not puncture it or cause any harm.
I was very worried, thinking of all kinds of worse-case scenarios, but now I
am relieved.  Can't wait to bring her home tomorrow!