What weighs 5 oz. and is very dangerous?
A sparrow with a machine gun, of course!
Armed Sparrow
Explanation
Explain Bear
Alright listen up buttercup, this is a riddle. So you think of a bird, right? Harmless, cute. But BAM! It's packin' heat! A machine gun! That's unexpected and funny, because birds and machine guns usually don't mix. And you, my friend, probably didn't mix your socks correctly today, did you?