strange menu on top sometimes pops up, why?

Nothing strange about it.

It's called Reachability.

"Touch ID button is double-tapped (not pressed).

Tapping the Touch ID button (home button) twice will bring the top half of the iPhone screen

down to the middle of the display.

This means controls or apps at the top of the screen can be reached without using a second hand."

jelle.belle ~ Here's some info about that "Reachability" feature:

Adjust touch settings on iPhone

...found by searching Apple's Knowledge Base.

õ¿õ¬

You still enabled it yourself.

Per default it's set to off.

I only said it is not on by default; so you must have enabled it yourself.

What's unfriendly about that??