Drip drop blip

Drip
Drip
Drip
Drip
Drip
Drip
Drip
Drip
Drip
Drip
Drip
Drip
Drip
Drip
Drip
Drip

Drop

A person can spend a long time standing under the porch waiting for one to turn into the other.

Though it's probably not strictly necessary for their colleague to describe them as a "dangerous loner" while they're doing it...