>Here's one for the weekend - which Tube station can symbolised be using just the emojis for a shower and a toilet?
And what about a ribbon, followed by five cars?
This quiz has been doing the rounds in the darker corners of the internet since Monday afternoon, when a Mumsnet user asked for help with a quiz she was stuck on.
Then, in celebration of yesterday's tube strike chaos, a Reddit user published the same quiz.
Many are pretty straightforward (although far be it from us to give the answer away) - but one in particular has caused consternation. The 12th question, which features a clock, a bus, and a Canadian flag, has users on both Mumsnet and Reddit totally baffled.
One suggested "Barbican": "Bar for barometer (not a clock), bu for bus, can for Canada."
Another suggested "Deptford: it's between Greenwich and Canada water and middle symbol could be a bus depot?"
Finally, one Reddit user solved the whole thing:
"1 - Closed due to strike 2 - Closed due to strike 3 - Closed due to strike 4 - Closed due to strike 5 - Closed due to strike 6 - Closed due to strike 7 - Closed due to strike 8 - Closed due to strike 9 - Closed due to strike 10 - Closed due to strike 11 - Closed due to strike 12 - Closed due to strike.
"You might be able to tell I'm a disgruntled commuter today," they added.