Fics like Watching of Across the 2nd Dimension

With the realization that they had absolutely no idea what they had done to celebrate the five year anniversary of their dear pet Perry, Phineas and Ferb create a device that can dig into their deepest memories and reveal what they cannot remember. But the truth is more shocking then any of them will realize. (Or: the kids react to ATSD)

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1. Take Me to the Hospital by shadowfire125 (Phineas and Ferb)
2. Two Worlds, One Family by detectivejigsaw (Gravity Falls, Phineas and Ferb)
3. Deconstructing (and Reconstructing) the Flynn Fletchers by TheChristianNerd (Phineas and Ferb)
4. Quiet Revelations by ShadowoftheLamp (Phineas and Ferb)
5. Sci Meets Sci by detectivejigsaw (Gravity Falls, Phineas and Ferb)
6. Transcendent Protection by TheSovereigntyofReality (Marvel Cinematic Universe, Phineas and Ferb)
7. Maybe He's Just Taciturn by BlackEyedGirl (Phineas and Ferb)
8. A First Meeting by Winter_S_Jameson (Phineas and Ferb)
9. A Tale of Two Birthdays by detectivejigsaw (Gravity Falls, Phineas and Ferb)
10. Return to Sender by tinkertoysdamn (Phineas and Ferb)
11. Let's all assume the worst by KissingLizard (Phineas and Ferb)
12. Time Out by radondoran (Phineas and Ferb)
13. Playing Dead by PopcornFairy28 (Phineas and Ferb)
14. Platypus Gone Rogue by TheSpiderWriter (Phineas and Ferb)
15. The Transmigratinator by Boomchick (人渣反派自救系统 - 墨香铜臭 | The Scum Villain's Self-Saving System - Mòxiāng Tóngxiù, Phineas and Ferb)
16. frittatas and steaks by dearingsattler (Phineas and Ferb)
17. Following Perry by MortalAnonymous (Phineas and Ferb)
18. And In This Crazy Life by CongressIsAliens (Phineas and Ferb)
19. Travel Sickness by Brokenmachine (Phineas and Ferb)
20. Stuck on You by Clouds (Miraculous Ladybug, Phineas and Ferb)