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It's on the Tip of My Tongue - Seven of Diamonds -
Perfect image to reveal the card you've forgotten. You can't remember the name of the card, it's just on the tip of your tongue!
Here is a great card routine. Somebody picks a card and hides it back in the deck. You attempt to find it, but can't. You offer the shirt off your back if you can't find it this last time. Upon failing, you remove your outer shirt to reveal the card printed on your t-shirt. Lots of fun ideas can be added to this trick, use your imagination and brainstorm with fellow magicians.
Merely force the card on your volunteer
(instructions), then reveal their card by opening your outer shirt to display your t-shirt.
A great kicker afterward is to get two shirts with the same design but
different cards. After you've revealed the first card to a group, change shirts in private. When the previous group asks you to do the same trick for somebody else, you'll blow them away when the card on the shirt is now different!
Gets great response at just about any informal event, and perhaps a few formal gigs.