fan the flames

bandwagon fan

A fan who has shown no past loyalty to a team and supports them all because they are actively succeeding or trendy.

fair-weather fan

A fan who only pays attention to their favorite team when they are performing well.

fan dance

The incremental disclosure of tantalizing bits of information.

fart fan

A ceiling fan in a bathroom

go down in flames

To fail miserably and with long-term consequences.

go up in flames

To catch fire.

hit the fan

To have a dramatic, usually negative, effect.