Why do some stocks spike for one or two trades, then drop back down to market price?

For example, if I look at Microsoft today, it was $330ish all day. Then it spiked to $360 for two trades, before dropping back down to $300 range. At 5:47pm (after hours of course).

I've seen this often in stocks and always wondered. I figured someone in Reddit is smart enough to answer for me. Thanks ahead of time.