When skies wept blood for Imam Hussain (asws)

When Imam Hussain (asws) was martyred, the sky rained blood. Butter and milk was also turned as red as blood. 

 It is reported that when Imam Hussein (asws) was Martyred not only the residents of the heavens cried for Imam Hussein (asws), but even the skies cried for him.

Imam Mehdi (asws) weeps blood for imam Hussain

(asws)

Imam Mehdi (asws) mourns for Imam Hussain (asws) every day - night and day -and he weeps blood for his great grandfather, as seen from his declaration he makes in his Ziyarat, know as Ziarat al-Nahiya:". . . now that I could not be with you on the day of Ashura to defend you and fight off your enemies,

I shall mourn you every morning and every evening, and I shall weep blood for  you instead of tears...