I heard this one's been going on a long time, and supposedly, nobody has figured it out...me, neither:
"There are 3 words in the English language that end with 'gry'...
one is Angry, the other, Hungry. What is the third word?"
___________gry
"Everyone knows what they are what they are used for,
And everyone uses them every day.
And if you've listened very carefully,
I have given you the word."
Wanna give it a try?