Same scenario, except that everyone is speaking English. Due to the fact the atmosphere in that warehouse has been loud the whole time you were there (forklifts running back and forth, horns being beeped, Americans all talking and yelling English back and forth amongst each other), you happen to not get the "GET OUT OF THE WAY, or LOOK OUT" warning that driver is trying to relay to you cause you've tuned out and are ignoring anyone yelling in the background. If you heard the warning at all, you heard if because of the sense of urgency and decibel level, not the language, and as OVM notes, you'd have heard the same sense of urgency and decibel level in any language.
In the scenario of the Mexican warehouse, if you turn your back on a forklift driver while he is loading your truck, or stand there in a path where forklifts can go, and aren't giving the forklifts your full and undivided attention, then you're an idiot, and any language barrier is a non-issue.
In the scenario of the Mexican warehouse, if you turn your back on a forklift driver while he is loading your truck, or stand there in a path where forklifts can go, and aren't giving the forklifts your full and undivided attention, then you're an idiot, and any language barrier is a non-issue.