A man was invited to a wedding.
When he reached the hotel, he
found two doors written on them:
1. Bride's relatives
2. Groom's relatives
He entered the groom's door and
found two doors again.
1. Ladies
2. Men
He entered the men's door and
found two doors again.
1. People with gifts
2. People without gifts
He entered the second door (people
without gifts) and
He found himself outside the hotel.