Kaleea: In my case, it's the theme from the TV show The Simpsons that smacks me with tri-tone-ness. That, and every time my 8-year-old nephew goes to play the piano.

(Okay, so the nephey thing is my fault for telling him it was a good way to annoy his mother, in an effort to make learning the keyboard fun. She didn't think that was too cute. Stacked minor seconds for chords tend to have the same effect.)

For fun with Tri-tones, find a piano and play C, E, F#, G, A#, and C# (the C# can be the one right above the low C, but this way produces a nicer effect, imho). There, you have a C Major chord and the resulting tri-tones from each note within the chord (producing an F# Major chord, one might add). Guaranteed to drive anyone batty after just 30 seconds!

Best wishes, all.
-J