Not sure if this has been posted before as it was an old episode, but tonight on How I Met Your Mother Ted (played by Josh Radnor ) was dating Robin (Cobie Smulders). They were in the bar and Robin quickly tickled Ted under his arm. he jumped a little and grinned, but music was playing over it so i couldnt tell if he yelped or laughed. it was a cute little scene and i love Josh Radnor so i hope he is ticklish.