My personal human benchmark: "Jump on one leg, while reciting the national anthem of Latvia, translated to Spanish, backwards, while drawing a frog with a brush held by toes of the other leg, on the ceiling". So far they're not doing very good but I'm sure they'll improve over time.
How about a wall and the national anthem of Sweden? I don't know Latvian or stretch that much any more. I'm actually half tempted to try that...