WASHINGTON — It could be a well-rehearsed zinger or an offhand, too-loud sigh.
Notable moments from past presidential debates demonstrate how the candidates' words and body language can make them look especially relatable or hopelessly out-of-touch. They also can showcase candidates at the top of their policy game or suggest they're out to sea.
Will past be prologue when President Joe Biden and former President Donald Trump debate in Atlanta on Thursday?
''Debates, being live television events, without a script, without any way of knowing how they are going to evolve — anything can happen,'' said Alan Schroeder, author of ''Presidential Debates: 50 years of High-Risk TV.''
Here's a look at some standout high moments, low moments and curveballs from presidential debates past.
That old age questi
on (again)
When everyone knows a sensitive question is coming yet you make the answer sound spontaneous, you're having a good debate. Republican President Ronald Reagan landed a line for the ages in the second presidential debate of 1984 after an underwhelming opening matchup.