"Lucky Guess" joke

Eighty-five year old Clara bursts into the recreation room of the retirement home and walks over to a bunch of men playing cards. Holding her clenched fist in the air, she saucily announces, "Ok, gents, anyone who can guess what's in my hand can have sex with me tonight."
"A hippopotamus?" guesses a witty elderly gentleman.
Clara thinks for a moment and replies, "Close enough!"