What a timely cartoon....50 years later....although illegal immigration isn't the issue here - it's stealing and eating some cheese! Here we see a bunch of little mice (in sombreros) behind barbed wire at the border in Mexico. Just 50 yards away on the American side is the Ajax Cheese Company....and those mice want that cheese. Guarding the border is the hapless Sylvester the Cat.
They draw straws to see who is going to race over give it a shot. Timid "Manuel" draws the short straw, but he lasts only seconds. The mice throw away is sombrero in a pile, signifying he's the latest casualty in the unsuccessful venture.
Finally, one of the mice suggests they go get "Speedy Gonzales." Most of the others haven't heard of him but those who have all describe him as "the fastest mouse in Mexico." One guy says, "I can contact Speedy because he's a friend of my sister." A wise-guy mouse remarks, "He's a friend of EVERYBODY's sister!! (You can read into that, what you want!)
Speedy then struts his stuff, and Sylvester tries to stop him. The racing rodent goes back and forth a number of times and the cat tries a different method to stop him each time. You can guess the result.
A steady diet of Speedy yelling "arriba! arriba!" all the time might grow tedious, but seeing him once in awhile is a treat.