If you can't be rhankful you didn't live in
Isreal in Biblical times. Judges 12:5 and 6 state that the Hebrew word "shibboleth," meaning "ear of corn" was used as a test on the rebellious Ephraimites who could not pronounce a "SH" sound, but said "sibboleth" instead:

"...and he said sibboleth: for he could not pronounce it right. Then they took him and slew him at the passages of Jordan: and there fell at that time of the Ephraimite forty and two thousand."