The Objective Theory of Bank Heists?

Apparently, a man in Georgia sent a 12-year-old girl into a bank with a yellow post-it note stating: "Give me your money this is a stick up."   The teller tripped the bank's alarm and, when the cops and FBI showed up, the man said he was "only joking."

Sounds like a criminal case, not a contracts case, but it does have notable similarities to the interaction between Lucy and Zehmer.  See Lucy v. Zehmer, 196 Va. 493 (1954).  Though, there is no indication that the joking bank robber was "high as a Georgia pine."

[Meredith R. Miller]