Is it because it looks like a testicle that we feel weird, or just the fact that it's not being served like we're used to?

It's like the time people started peeling lemons and limes. It just feels wrong and makes us want to take a shower to cleanse ourselves. There's no real trick to this apart from a lot of planning and preparation, so you could very easily do it yourself (but only if you're willing to out yourself as weirdo who likes fruit too much.

Via YouTube