Rumor has it some yeshiva bachurim were pulled over for speeding and played it out like they didn’t know hebrew. Every time the cop started talking the driver would say, ‘no understand ani tapuach’ the more frustrated the cop got, the more the driver would insist ‘ani tapuach’ until one of the wise allecks from the backseat called out, ‘kulanu tapuchim’.
Supposedly they got let off.