here we go.
i can be caught yes i can, but not thrown at least not by hand, its easy to know me, when you have me, i like to stick around with you, even if it makes you blue, but alas i don't stay forever, i wish i could, for as long as im around you shall see that i will never, be all that good, no not in the least, but till i do leave you should not feast, for i am one of the worst there are, and you should not stray to far, for home is where you should reside, and sooner or later you will find that i died.
what am I?