The tool {{{evtest-capture}}} is currently only available in a git repository. To install it, do the following:
{{{
 $ git clone http://cgit.freedesktop.org/~whot/evtest
 $ cd evtest
 $ autoreconf -iv
 $ ./configure
}}}

Once the tool is installed, simply do the following:
 1. run the tool
 1. perform various touch actions (e.g., make some gestures on the target surface)
 1. share the output with friends :-)

{{{
 $ sudo ./evtest-capture 
Available devices:
/dev/input/event0:	Lid Switch
/dev/input/event1:	Sleep Button
/dev/input/event10:	N-Trig MultiTouch
/dev/input/event11:	N-Trig Touchscreen
/dev/input/event2:	Power Button
/dev/input/event3:	AT Translated Set 2 keyboard
/dev/input/event4:	Integrated Camera
/dev/input/event5:	ThinkPad Extra Buttons
/dev/input/event6:	SynPS/2 Synaptics TouchPad
/dev/input/event7:	Video Bus
/dev/input/event8:	TPPS/2 IBM TrackPoint
/dev/input/event9:	N-Trig Pen
Select the device event number [0-11]: 10
Writing to 'evtest-capture.xml'
Capturing device 'N-Trig MultiTouch'.
Press Ctrl+C to stop.
}}}

After hitting {{{^c}}}, the capture will be available in {{{evtest-capture.xml}}} in the current directory, ready to be attached to a bug :-)