Babylon 5, Season 5: The Wheel of Fire

[Lyta demonstrates her telekinesis by "slapping" two of Bester's Psi Cops]

Alfred Bester:
Not bad. Tell me, is that really telekinesis, or are you just pushing the nerve endings, making them feel as if they've been slapped? Either way, it's taken a lot out of you, Lyta. You're sweating, flushed. How many times can you do that, Lyta? Can you do just one at a time? Maybe two? How about three? How about a half dozen of us?

Lyta Alexander:
I don't know. Like you said, I'm new at this. I could even make a mistake. Maybe even pop a blood vessel in someone's head by accident by pushing too hard. Feel like playing the odds, Mr. Bester?