You should have known that Evan would escalate from flattering Margo into a false sense of security while stealing Margo's clients to constructing a bomb, elaborately wrapping it in graph paper and leaving it in her closet while dressed like the Gorton's fisherman? That's impressive foresight.
Isn't Martin wealthy? He couldn't spring for IHOP? The Manhattan General Cafeteria selection looks...nonexistent. Greg will be much more able to regale Martin and Gabriella with the Evan backstory if he's got a Rooty Tooty Fresh and Fruity under his belt.