This act proved that showing appreciation is rewarding on both ends.
In a video uploaded to YouTube, a life coach asks random passersby to write a thank-you letter to the person who has helped them become successful in life.
The coach then unveils a phone booth, and gets the strangers to call the people who have supported them and express their gratitude by reading the thank-you note.
While the people who received the call were surprised and affected, it was the callers themselves that said the beautiful moments touched them emotionally -- some were even moved to tears.
WATCH the video above to see the powerful exchanges.