For the next few days, as everypony recovered from Discord's fun time, Derpy pretended to be her normal carefree self. She flew into things, she dropped things, she broke a great many things. She found that deliberately being clumsy wasn't easy.
While she was busy being what everypony expected her to be, Derpy was constantly noticing how Ponyville could be built or ran better. Sometimes she would even do something about it, like dropping a note into the mailbox of the mayor, or whichever pony would best be able to benefit from her insights. It made her happy to see her suggestions put to use, making other ponies happy.
She also started to notice strange things happening around Ponyville. Stuff would fall from windows, or break without warning. She happened to be near when the balcony of the retirement home broke, and she cheered along with everyone else when Rainbow Dash saved the falling ponies.
Derpy grew quiet when she saw a strange pink pony slip around the corner of the home. Nopony else had seemed to notice her, and when Derpy went to investigate a moment later, there was no pony there. She blinked in surprise; there was no way that an earth pony could have disappeared that quickly. There weren't any doors or openings that she could have ducked into.
Later that day, Derpy was flying over the construction site for a new house when she saw the same pink pony running around the crane a second before the smoke started pouring out of the cab. The instrument panel shorted out, sending the crane swinging out of control. The beam that it was carrying smashed into the frame, causing a chain reaction that brought the building crashing down on the construction workers.
Derpy caught a glimpse of a strange pony dressed in purple with a hat and cape before she headed off in pursuit of the pink pony, having spotted her leaving the wreckage. She was almost close enough to touch her when the other pony darted around the corner of City Hall. Derpy followed immediately, but she was gone. She flew up into the air, looking down at the town in confusion. Suddenly, she spotted the other pony's propeller beanie. But, impossibly, she was all the way across town, heading into Sweet Apple Acres. Derpy shook her head and headed for home. She'd think over what she'd seen before bed.