Imam Hassan Askari (as) and the wild animals:

Mu'tamid, the Abbasid Caliph is just like his forefathers he too was
an open enemy of the Ahlul Bayt (as). He declared that Imam Hassan
Askari (as) should be imprisoned and that no mercy should be shown to
Him. And hence Mu'tamid, the Abbasid Caliph went to Salih bin Wasif
and told him to treat Imam Hassan Askari (as) harshly. Salih bin Wasif
sent for two of the evilest men he could find to take charge of the
Imam, but the men changed into men of worship, prayer and fasting to
an amazing extent. When Salih bin Wasif interrogated them about their
change in character, they said: "What can we say about a man who fasts
through the day and stands (in prayer) through the night, who does not
speak and occupies himself with nothing except worship? When he looks
at us, our limbs shake and within us is (a feeling) which we have
never had."
Then Imam Hassan Askari (as) was handed over to a man named Nahrir,
the Jailer who was a very cruel man was once advised by his wife who
said to him: "Fear Allah (SWT), have you no idea of who is imprisoned
in your prison? He is a pious man and a great worshipper of Allah
(SWT). I am afraid that Allah (SWT) will curse you." Her husband said:
"O' really. Just watch me; I am going to send him inside the cage of
the wild animals."
Nahrir, the Jailer got the permission from his Abbasid Caliph and
carried out his plan.
Imam Hassan Askari (as) was sent to this cage and the people thought
that this was the end of Imam Hassan Askari's (as) life. But when they
returned to look what had happened instead they all witnessed that
Imam Hassan Askari (as) was praying surrounded by the wild animals
which all were prostrating before Him. Now the order was given to take
Imam Hassan Askari (as) out from there.