And the Prophet (peace and blessings be upon him) said that if a bucket of "Ghassaq" (the water of Hell) were to be poured out on the earth, its stench would spread throughout the whole world.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 11230M
Hadith Gradingحکم دارالسلام:إسناده ضعيف لضعف دراج فى حديثه عن أبى الهيثم، وابن لهيعة متابع
And the Prophet (peace be upon him) said that the earth consumes everything of the human except the coccyx (tailbone). Someone asked, "O Messenger of Allah! How much of the coccyx remains?" He replied, "As much as a mustard seed, and from that you will be resurrected again."
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 11230M
Hadith Gradingحکم دارالسلام:حديث حسن لغيره، وإسناده إسناد سابقه