We've all seen our fair share of bandwagon fans but this one in Milwaukee last night might be the biggest ever.

This young fan went to the Thunder–Bucks game wearing a Russell Westbrook jersey. But after Giannis Antetokounmpo blocked Westbrook's layup attempt, that all changed.

Take a look at this unbelievable act:

The fans behind him surely let him hear about it the rest of the night.

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Here was the block that sparked the change of heart:

https://vine.co/v/590x1172XxF

There's nothing wrong with being a fan of both Giannis and Russ in the privacy of your own home, but don't have a public battle with loyalty at a game between the two.

Giannis and the Bucks went on to beat the Thunder, 98-94. And this young fan was of course happy with the result, whatever it was going to end up being.