The song includes words from stickers that are placed on cars in Israel.

VOA: special.2009.11.25

And my bet is when they chose the stickers they had a pretty good sense of why, of which ones the boys would prefer in those studies.

我猜是当研究人员选择挑选贴纸时,他们很清楚男孩们会在这些研究中,喜欢哪些贴纸

耶鲁公开课 - 心理学导论课程节选

These bumper stickers are usually about political issues.

VOA: special.2009.11.25