3 Mexicans are about to cross the border

They are stopped by the border patrol who stops the first Mexican and says,

"If you can say the entire English alphabet, I'll let you pass",

the Mexican agrees and goes, "A, B, C, D..... ahhh I can't do it!", and walks away

the border patrol stops the second man and says,

"If you can count to 10, I'll let you pass"

The Mexican agrees and says, "1, 2, 3, 4, ahhhh.... I can't do it!" and walks away

the border patrol stops the third man and says,

"If you can use the words: PINK, GREEN, and YELLOW, in a sentence, I'll let you pass"

The Mexican goes,

"O! O! I can do this! When I'm at home, the phone goes GREEN GREEN, I PINK up the phone and say 'YELLOW!'"