Experienced three as a pax over the past 20 years.
BAC 1-11 at Birmingham
L1011 (TriStar) at Heathrow
BAe 146 at London City (briefly touched down during the manouevre)
And I've done a few as pilot of small aeroplanes, usually because the aircraft that landed ahead had not cleared (turned off) the runway.
I guess if you are an inexperienced pax, then it can be a bit sudden and unexpected and if the aeroplane is bouncing all around in winds, that doesn't help either.
In a way, a privilege to witness the performance of a modern jet transport aircraft and the impressive rate of climb and acceleration
Its the high speed rejected takeoffs that you don't really wish to be around.