A few nice euchre score cards images I found:

Feb 2: Saturday Night Euchre Tournament at the Compound


Image by chinycjo
"For some Euchre players in the Midwest, when a team has nine points, players place the score cards next to each other, face down. The team is now "in the barn" (also "on the corner") or "mooing". Some players have also been known to place the two score cards behind their ears upon "entering the barn." A particularly vulgar celebration ceremony involved with "entering the barn" is "milking the cow," whereupon one member of the team that just "entered the barn" interlaces their fingers and points their thumbs downward. This completed, their teammate "milks" the down-turned thumbs just as one would milk a cow’s udder. If the team scores their tenth point then the "barn doors are opened:" the cards are flipped to show all ten pips. Actions such as this, however, are considered insulting."
- Wikipedia