Just type "a sign that reads" at the end of your input.
"Person riding a bike in england, a sign that reads" that sort of thing, just end it in "a sign that reads"
The stuff bing is trying to add at the end of your prompt will appear on a road sign of some kind somewhere in the prompt, and it can be quite hilarious.
https://i.imgur.com/Wma3g8Q.png
Just an example of it doing it, but you could make it more troll-y by asking for say, romans, or vikings.
I remember the Homer Simpson one with that lol