Also, they’re sensitive to moving shadows. As with motion sensors, if you move slowly enough, they cannot sense you. Slowly circle behind them and they jump into your death mitts.
Anyway, this has worked out better for me than a Bic lighter and hair spray. But that works too.
clapping with both hands works too
“Mom, mom” —said the little fly— “humans really like us, they saw me and started to clap non-stop”