Ye Olde Standard Kilt Joke
One late night, as they were making their way home from a night of drinking, two young lasses encounter an unconscious man in a kilt. They realize that they have an opportunity to answer that most pressing question, so they lift his skirt. Nothing there but him. They tie a blue ribbon around his manly parts, to let him know they were there, and continue on their merry way.
The next morning, our Scotsman lifts himself from the ground, wipes off the dirt, and finds a nearby tree, to rid himself of the last night's beer. He spreads his kilt, looks down, and exclaims, "I don' know where ye've been, laddy, but wherever 'twas, ye won first prize."