Picuino, Thanks. I think that solves it.
rstofer, Thanks. Good to know. I checked the data sheet and think it's 2V (threshold High). I think my body was produced the signal. (I am not grounded 😈).
IanB, Thanks. I will keep those clamping diodes for input protection in mind, I'm working towards experimenting/building something with those.
emece67, 7400. The circuit: Both inputs of a NAND tied to an input (floating/5V/ground). Then the output of that NAND becomes the input to both inputs of another NAND. Effectively an AND gate (with it's inputs tied together). 664 ohm resistor. 3V LED. 5V source.