Guru Nanak during his visit to JaganNath Puri in Orissa came across a fake Sadhu pretending to see three worlds with his eyes shut and nostrils closed between the thumb and fingers as he sat in lotus pose (padmaassan). He promised his devotees to show the Three worlds (swarag, mirat and patal lok) if they sat there in meditation with him. He had kept a lota (bowl) in front of him meant for donations. Guru Sahib and Mardana also sat there along with other people. As everybody sat with their eyes closed, Mardana, under the direction of Guru Sahib, picked up the lota and kept it behind the sadhu. When he opened his eyes and saw the money gone, he started screaming in a fit of rage. Guru Sahib smiled and asked him, “If you were claiming to visualize all the three worlds, then how come you didn't see your lota?" Then Mardana picked up the bowl and showed it to him. He admitted that he could not see anything with closed eyes and simply fooled innocent people. The following Shabad of Guru Nanak in Raag Dhanasiri explains the whole incident.

ਧਨਾਸਰੀ ਮਹਲਾ 1 ਘਰੁ 3 ੴ ਸਤਿਗੁਰ ਪ੍ਰਸਾਦਿ ॥
ਕਾਲੁ ਨਾਹੀ ਜੋਗੁ ਨਾਹੀ ਨਾਹੀ ਸਤ ਕਾ ਢਬੁ ॥ ਥਾਨਸਟ ਜਗ ਭਰਿਸਟ ਹੋਏ ਡੂਬਤਾ ਇਵ ਜਗੁ ॥1॥ ਕਲ ਮਹਿ ਰਾਮ ਨਾਮੁ ਸਾਰੁ ॥ ਅਖੀ ਤ ਮੀਟਹਿ ਨਾਕ ਪਕੜਹਿ ਠਗਣ ਕਉ ਸੰਸਾਰੁ ॥1॥ ਰਹਾਉ ॥ ਆਂਟ ਸੇਤੀ ਨਾਕੁ ਪਕੜਹਿ ਸੂਝਤੇ ਤਿਨਿ ਲੋਅ ॥ ਮਗਰ ਪਾਛੈ ਕਛੁ ਨ ਸੂਝੈ ਏਹੁ ਪਦਮੁ ਅਲੋਅ ॥2॥ ਖਤ੍ਰੀਆ ਤ ਧਰਮੁ ਛੋਡਿਆ ਮਲੇਛ ਭਾਖਿਆ ਗਹੀ ॥ ਸ੍ਰਿਸਟਿ ਸਭ ਇਕ ਵਰਨ ਹੋਈ ਧਰਮ ਕੀ ਗਤਿ ਰਹੀ ॥3॥ ਅਸਟ ਸਾਜ ਸਾਜਿ ਪੁਰਾਣ ਸੋਧਹਿ ਕਰਹਿ ਬੇਦ ਅਭਿਆਸੁ ॥ ਬਿਨੁ ਨਾਮ ਹਰਿ ਕੇ ਮੁਕਤਿ ਨਾਹੀ ਕਹੈ ਨਾਨਕੁ ਦਾਸੁ ॥4॥1॥6॥8॥

No, no, this is not the time, when people know the way to Yoga and Truth.

The holy places of worship in the world are polluted, and so the world is drowning. ||1||

In this Dark Age of Kali Yuga, the Lord's Name is the most sublime.

Some people try to deceive the world by closing their eyes and holding their nostrils closed. ||1||Pause||

They close off their nostrils with their fingers, and claim to see the three worlds.

But they cannot even see what is behind them. What a strange lotus pose this is! ||2||

The K'shatriyas have abandoned their religion, and have adopted a foreign language.

The whole world has been reduced to the same social status; the state of
righteousness and Dharma has been lost. ||3|| They analyze eight chapters of (Panini's) grammar and the Puraanas. They study the Vedas, but without the Lord's Name, no one is liberated; so says Nanak, the Lord's slave. ||4||1||6||8||

The shabad which follows this in Guru Granth Sahib on Ang 663 is Aarti, which we all know was also sung by Guru Nanak at Puri.