I bought a donkey (or mule, whatever) painted like a zebra in Tijuana on the morning after a all-nite rout of drunkeness and "massage parlor" sex...
Actually, he didn't take credit cards so I had to take the cash out at an ATM- but the currency exchange was seemless!
Couldn't walk the donkey across the border, tho, so I gave it to a 10-year-old street girl on my way back.