How to make a universal remote with my iPhone?

I have an iPhone 5 and I'm looking to make a makeshift Infared remote using my phone or anything else to turn off or on or do any other controls for any TV. Basically I want to mess with people.

Do you know how universal remotes work? It doesn't sound like it. You would have to program the remote to the specific tv, but if you know how to do that then sure mess around, again doubt it would work like you're intending it to. I'm sure there are many apps on the app store, just search around. You could also go pick a universal remote up at walmart or eBay or something.

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