I've been doing some research after experiencing this issue, and
stumbled across this.  It may be nothing but for me this only seems to
happen when my MacBook Pro is connected to the mains.  When unplugged it
goes away, and also when keeping a finger touching the chassis whilst
using the touchpad, it also hasn't happened yet.

I didn't notice this under OSX so maybe there's some extra checks going
on behind the scenes there for contact patch size or reduced touchpad
sensitivity.

Steps whilst plugged in, 
1, use laptop for a while
2, two fingers together on touchpad (not touching anything else), swipe slowly 
and gently upwards to scroll the page
3, alt tab switcher opens, switches to next window, closes, instead of 
scrolling upwards

Laptop unplugged or with a 3rd finger touching the metal body?  Nothing
unexpected happens.

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https://bugs.launchpad.net/bugs/1264795

Title:
  Alt+Tab Switcher randomly activates itself

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