Look closer, much closer
Zoom in, out, all about
Pair with domain experts
“Monkey, monkey, bugs, bananas! Monkey.”
Is monkey testing a test idea? 
Big, small, lots, few, none
Use it
fill for min chars
Turn off and on again.
3 Likes
happen will what backwards go?
error handling
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When, time, date, timezone, leaps
“Check if button is clickable”
I start with the most basic and obvious case to get me started in the flow of writing cases, and then I build the complexity of cases based on the test design/test plan.
“What would adjective users do?”
new, experienced, bored, hacky, happy, sad, stressed, stressing …
Phrased differently in 5+1 words:
“By which motivation would users do what?”
great one there - very good 
Don’t test only clean devices.
or
Don’t test only ideal environments.
(What) Will customers pay for this?
How can this hurt someone?
Can someone die?
How many resources needs it?
exploratory test design
Team up with the devs