How do I break up my sister and her boyfriend?

[Thames valley police]

My sister has been going out with this guy for a year and a half anyway I bet my friend £100 that I can break them up in 3 days ( I need the money to go to Off The Tracks
as I rely want to see Peatbog Faeries live! Any tips its been a day already

[RipJack]

kill one of them. or both. or just steal the money.

I dont really give a fuck

[Estefania Gamez]

why would you break someone up . thats mean

[Sticky Icky]

tell her that her boyfriend hit on you lol itll work great if youre a chick and even better if youre a guy

[James Walker]

Tell her boyfriend that she is cheating on him.

[Foolishgoldfish178]

In my opinion that's very mean .. but if you really want my advice ..

Every time he comes over , embarrass your sister, ask him questions ,
"Did you guys have sex yet ?"
"Are you thinking about doing oral yet ?"
"You better be using condoms!"
Scream : "Mom ! There doing dirty stuff over here !"
Show your sister what a penis looks like (right in front of him) and gross her out with weird pictures of people having sex .
Hack her facebook account and change her relationship to single - and send him a letter saying im breaking up with you
Tell your sister you saw him kissing a guy .
Try to scare him away with the dirtiest things you can thing of!