[Brashman]

Welcome to EE lab. In one lab as an undergrad, my partner and I found that we could get our circuit to work by attaching a capacitor with one end to our circuit and one end to a random place on the breadboard. It made for a bit of a funny circuit diagram in the write-up where one end of this capacitor was connected to nowhere.

[harrytuttle]

Ex EE here (RF/mixed signal). I always modelled it as everything being connected to everything via a tiny capacitor and a big resistor in parallel. This allowed a few odd scenarios to be reliably identified, especially in UHF frequencies and above.

The trailing capacitor just had a large value invisible resistor attaching it to your circuit somewhere :)