Allah Most Wise says:
"Truly Allah guides not one who transgresses and lies." [Quran:40:28]
"Curse of Allah upon those who lie." [Quran:3:61]
The Messenger of Allah(peace be upon him) is reported to have said:
" I guarantee a home in the middle of Jannah for one who abandons lying even if its just for the sake of fun'' [Hadith:Abu Dawud].
"The signs of the hypocrite are three: when he speaks, he lies; when he makes a promise, he breaks it; and when he is entrusted with something, he betrays that trust." (Narrated by al-Bukhaari, 33; Muslim, 59)
Hazrat Wasilah[Allah be pleased with him] reported that the Messenger of Allah(peace be upon) said: "Do not display pleasure at your brothers misfortune."[Hadith-Tirmizi]
It was narrated that Abu Hurayrah[RA] said: "They said, 'O Messenger of Allaah, you joke with us.' He said, 'But I only speak the truth. " (Hadith-Tirmidhi, 1990)
The Prophet (peace and blessings of Allah be upon him) said: "Whoever imitates a people is one of them." (Hadith-Ahmad)
It was narrated by Mu'aawiyah ibn Haydah[ra] that he heard the Prophet (pbuh) say: 'Woe to the one who talks to make the people laugh and tells lies, woe to him, woe to him." (Hadith-Tirmidhi,Abu Dawood).
It was narrated by Asmaa´ bint Yazeed[ra] that the Messenger of Allaah (pbuh) said: "It is not permissible to tell lies except in three (cases): when a man speaks to his wife in a way to please her; lying in war; and lying in order to reconcile between people." (Hadith-Tirmidhi, 1939)
Allah Protect us from this evil practise!