I pray your brakes go out running down a hill. I pray a flower pot falls from a windowsill, And knocks you in the head like I'd like to. I pray your birthday comes and nobody calls. I pray you're flying high, when your engine stalls I pray all your dreams never come true. Just know wherever you are honey, I pray for you.
A character is praying to God or to other similar deity known to be benevolent and merciful. However, this devotee is praying for malice, begging God to be petty and cruel. The technical name for this kind of thing is an "imprecatory prayer", though the more colloquial term for this kind of thing is a Curse, especially if this prayer has any kind of supernatural effect.
For example, a Racist Grandma may pray that the good lord get all "niggers" killed, a Heteronormative Crusader may pray that the sweet local gay couple will get HIV, anyone may pray that his rich uncle or unliked neighbor will die or get raped or whatever, and so on.
If the character does this in a way that superficially comes across as very sweet and innocent, it may be Sugary Malice as well. Simply praying for victory in a conflict does not count, however.
No Real Life Examples, Please! - keep the real life issues to how they are portrayed in media.
Moore:Our Father in Heaven, before we go into battle, every soldier among us will approach you each in his own way. Our enemies too, according to their own understanding, will ask for protection and for victory. And so, we bow before your infinite wisdom. We offer our prayers as best we can. I pray you watch over the young Jack Geoghegan. That I lead into battle. You use me as your instrument in this awful hell of war to watch over them. Especially if they're men like this one beside me, deserving of a future in your blessing and goodwill. Amen.
Harry Powell: Well now, what's it to be, Lord? Another widow? How many has it been? Six? Twelve? I disremember. [tipping his hat] You say the word, Lord, I'm on my way... You always send me money to go forth and preach your Word. The widow with a little wad of bills hid away in a sugar bowl. Lord, I am tired. Sometimes I wonder if you really understand. Not that You mind the killin's. Yore Book is full of killin's. But there are things you do hate, Lord: perfume-smellin' things, lacy things, things with curly hair.
Parodied/Lampshaded in Monty Python and the Holy Grail, where the heroes pray for God not only to defeat their enemies, but to "blow them to tiny bits, in Thy Mercy".
Polish film Dzień Świra (Day of the Wacko) ends with the mock of a massive prayer (based on the popular Polish XVIII-century religious poem, no less) counting various accidents and unpleasantries praying people want to happen to their neighbours.
In Spiderman 3, after Peter exposes him as a fraud and gets him fired from the Daily Bugle, Eddie Brock goes to church to pray for God to kill Peter.
In A Song of Ice and Fire, there's a fairly sympathetic/understandable example with Arya Stark. Before she goes to sleep, she recites to herself a mantra which lists the names of her enemies, all of whom she plans to kill, and at one point, when she has an opportunity to engage in prayer, she recites the same list. She's a very angry ten year old, but you can't really blame her given all she goes through. Eventually she finds herself in service to an assassin cult who worship the God of Death.
And her sister Sansa is in the sept praying with many others before the upcoming siege of Kings Landing. When the High Septon starts calling on the gods to protect King Joffrey who executed her father and has her beaten and tormented in petty ways, the normally mild-mannered Sansa walks out. Let his sword break and his shield shatter. Let his courage fail and every man desert him.
The War Prayer by Mark Twain. After the congregation of a church prays for victory in a war, an aged stranger enters the church, claiming to be a messenger from God, and recites the unstated portion of their prayer, which calls for suffering upon suffering to be heaped upon their enemy.
In the Cambridge Latin Course, one scene shows a thief stealing an offering made to the gods, only to find that it's inscribed with a prayer for the death of all thieves. In terror, he throws his booty back and runs away.
This was actually a common practice in the Roman Empire; people would throw "curse tablets" into holy shrines imploring the gods to visit various misfortunes on those who'd wronged them.
This is one of the main elements of the plot in Lois McMaster Bujold's The Curse of Chalion. However, as it turns out, successfully praying for someone else's death will except in very unusual circumstances kill you too, and the gods will only answer your prayer if the person whose death you want actually deserves it.
Older Than Feudalism: Some of the Psalms in The Bible fit into this category. Elijah pretty much does this frequently, what with basically asking for a bunch of bears to maul bullies and all. Actually, most examples listed under Holy Hand Grenade could be considered this, as they are frequently summoned by prayers.
It Can't Happen Here: Before being executed at Trianon, Falck cries out a vengeful prayer against his oppressors.
"Father, Thou hast forgiven so long! Forgive them not but curse them, for they know what they do!"
In a family-friendly example from The Suite Life of Zack and Cody episode "Volley Dad," one of the nuns in Maddie's Catholic school prays that their volley ball team will viciously crush the opposing team.
Nun: Okay, we are gonna stomp these losers right into the ground! Let us pray. Lord, please help us stomp these losers into the ground. Amen.
Back when Stephen and Steven were still on The Daily Show, an "Even Stevens" segment had them debating whether Islam or Christianity was the one true religion. Needless to say, prayers of "Smite mine enemy" were evoked on both sides.
In Game of Thrones, Catelyn Stark admits that she once prayed to the gods for her husband Ned's bastard son Jon to die. She hated herself for being horrible enough to wish a child dead, but she was also too bitter to change. She thinks that all of the misery she and those close to her suffer throughout the series (it's a lot) is divine punishment.
Top Gear: As Hammond and May are loading May's car on a raft to cross an African river, Vitriolic Best Bud Clarkson stands on the other side and prays "Dear God, make it tip upside-down..."