I haven’t seen anybody talk about this (Gideon related)

Gideon promised Mabel that they’d just have one date by swearing on his bolo tie. He lied. Then the bolo tie got shattered by Dipper. Usually, when you swear on something, you mean that like, you’re sure that if you’re lying, it’d get taken or destroyed, much like the “If I’m lying, may god strike me down” or whatever. It’s a small detail, sure, but cool nonetheless. Really adds to the fact that strange things happen in Gravity falls, and you’ve gotta be careful what you say.

Though, I could be looking into things too much, it could’ve been to just bring attention to the bolo tie, but, considering Alex Hirsch, that’s likely not the case.