If you're able to remember the p and q method, a child could tie the Zeppelin Bend.
Are you sure? Test that theory on a few kids and get back with me. My niece (11) and nephew (15) screwed up the Zeppelin Bend after one week of not thinking about it.
Generally, all these knots of this type (e.g., Butterfly, Ashley, Zeppelin) are easy to screw up if you go into it thinking they're super easy. The person may not screw up as they're following pics, but I'm confident they'll screw up a week later after not thinking about whatever method they're using.
That's O.K. They screw up, humble themselves, and then really learn it.