George Russell quipped he would see whether Daniel Ricciardo should be investigated after interaction during practice for the Canadian Grand Prix.
The Australian is present at the Circuit Gilles Villeneuve as part of his reserve duties with Red Bull and took position on the pit wall on Friday.
FP2 was red-flagged twice after issues befell Alpine's Esteban Ocon and Haas' Nico Hulkenberg and it was during those stoppages that Ricciardo caught Russell's eye.
"There was a rogue Australian fan in the pit lane, I don't know what it was," joked Russell.
"He stuck his finger up at me as well, when I was waiting to go out. It was around the Red Bull area, I need to check the video and see if an investigation should go into this."
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Russell finished the day second fastest behind teammate Lewis Hamilton after the first session was rendered obsolete by CCTV issues.
This led to an extension of FP2 by 30 minutes to allow teams and drivers to play catch up and this led to a number of practice run plan strategies.
Mercedes ran its flying laps some half an hour later than Red Bull and Ferrari, which paid dividends on the timesheets.
"It was a strange day with what happened in FP1 and the extension of FP2," added Russell.
"It was a reasonably productive session, we can't read too much into the timings. We did our low-fuel qualifying prep towards the end of the session when the track was quicker.
"It is bumpy, blooming bumpy out there.