Possible Clues:

• Have a high-wire disaster
• Become unsteady
• One doesn't want to do this at a bank
• Have no money left in bank account for trip
• Fall, as a tightrope walker
• Stagger, seeing bank account emptied?
• Tip over, say
• Go into debt, presumably, so be about to collapse?
• Fall off a beam, e.g.
• Have a bad day at the bank?