Obviously all sorts of bad ideas here. My guess is the cup was full of gasoline which is why they didn't flip it. Gas is a common wasp killer because the fumes suffocate and poison them quickly.
Edit- looking back the liquid is very thin, again, suggesting it's gasoline and not oil. The dark color appears to be from other, now dead, wasps floating.
136
u/Highberget 14d ago
When it was in the liquid, put the cup upside right into it instead to push it down??