Item (direct transcription):

A Mexican with an erection runs into a wall. What does he break?

His lawnmower.

Background Information:

The informant read the joke on 9GAG, an online social media site.

Contextual Information:

The informant made it very clear that he would only tell the joke to someone he knew very well and was confident wouldn’t be offended.

Analysis:

This joke is a clear example of blason populaire, playing on the stereotype that all Mexicans are gardeners.