Aliens come to earth, one of them asks you “hey you, do the thing. Ya know the thing you humans do” what is the thing?

starts taking video for the live feed

Starts asking questions like OP on MassimoL about what is that thing that humans do, but in an unsuspecting way so people would have no clue that I met an alien and aliens are real (very much like OP)

The how-to:

1. Kill an endangered animal

2. Remove a coveted trophy from said animal. Leave the rest to rot

3. Sell the trophy to shady dealer

4. Use the money to buy drugs

5. Poison yourself with said drugs

6. Go to 1

Tells you pretty much everything an alien needs to know about humans

Cry.

Fart.

Negating their existence