#7: Neil Patrick Harris
While many people have fond memories of what certain celebrities were like before they were famous, not everyone shares such positive experiences. Some A-listers didn’t leave the best impressions pre-fame. For example, despite his friendly and charming persona today, many people who’ve met How I Met Your Mother star Neil Patrick Harris claim he wasn’t the nicest guy around.

Allegedly, Harris was a bit of a bully in high school, which might be surprising given his nice-guy image on screen. But that’s the thing about actors—they get really good at playing different roles, and it seems Harris has quite the talent for it.