Travis Credit Union employee Damian Alarcon told nearly 100 area teens a word-to-the-wise tale about overdrafts on his checking account. On his way to a college class one morning, he decided to stop at a coffee kiosk to buy a fancy cup of Joe, a latte, along with a baked good for a snack. The bill came to a little more than $7, he told the students, ages 14 to 19, who on Wednesday had gathered in the credit union's community room for a financial literacy workshop, Mad City Money. What he learned later, to his disappointment, he recalled, was that there was not enough money in his account when he swiped his debit card to pay the bill. With overdraft fees, the cup of coffee and snack came to more than $25 with the assessment.