- "I'm a psychic and can tell what's in these containers without looking"
- "I can detect water with magic rods"
- "I can heal you with the power of god"
It's worth watching An Honest Liar about the life of the Amazing Randi.
What's interesting is even when Randi shows people how they're being tricked they refuse to believe it.
The above examples are pretty easy to test (and people do), but believers just ignore the results or make up reasons why results don't matter or can't be tested.