Yeah, I mean - structurally speaking, there's not a lot that's impossible if you know what you're doing and you have the time to prepare for it.

[He has a lot of feelings on people who think you can't get into weird places just because they're up high or don't have stairs, okay.]

The bomb's more compelling as evidence, though. I'm not an explosives expert or anything, but trying to fake something like that sounds a lot harder.